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How to generate Gaussian white process noise

How can we generate gaussian white process noise in matlab?

Histogram to Probability ditribution function

Hi There, Do you know how we can convert histogram plot to probability density function plot? Thanks, maryam

imnoise on derivatives of an image

Hi, I have the following situation: - read an image (0..255 range); cast it to double precision; - compute its gradient (dIdx and dIdy, which obviously will contain both positive and negative entries) - try to add noise to the derivatives using imnoise function; The result of imnoise is scaled from 0 to 1. My question is how can I cast it back to its original range, which should contain both negative, and positive entries, without losing any information? Should imnoise only be used on images with positive intensity values? In this case, how do I scale the derivatives (shift, mayb

feature extraction and neural network classification

Good day everyone. Im new in matlab and currently doing a Chinese handwriting recognition using neural netwotk. I have done the image processing part which are cropping, grayscale n binarize stuff by refer at image processing tutorial. So im now stuck, that is after i binarize the character image, how could i extract the feature to used to train in neural network? I have also explore the nprtool, it needs a dataset which is mat-file to be trained is it? How could i create the mat-file from the features that extract? Thanks very much for guidance...

program

i'am looking for program of ASK(amplitude shift key) using MATLAB . kindly help me.

how can i increase no of i/o ports of blocks using in simulink

how can i increase no of i/o ports of blocks using in simulink. when iam practicing the simulink models some models contains blocks which r having more no.of i/o ports than present in the libraray block... ex. how can i able to make a scope with two i/o ports..and xy-graph with four ports...

inserting images into mysql database using matlab

hai, I would like to know how to insert images into mysql database and how to retrieve and display the inserted images. How to display the image that is converted into binary format? How to set the password field in matlab? Thanks in advance for your help.

Nyquist diagram for MATLAB GUI

I need a right code to show the nyquist diagram in the GUI given that the numerator and denominator of a transfer function is given The code I made % --- Executes on button press in pushbutton11. function pushbutton11_Callback(hObject, eventdata, handles) % hObject handle to pushbutton11 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) num=get(handles.edit1,'string'); den=get(handles.edit2,'string'); num=str2num(num); den=str2num(den); w=0:1:10000; [numCL,denCL]=cloop(num,den); s

Optimization with a variable of very huge dimension.

Hi all, In my class project, I need to develop a classifier based on Logistic Regression to classify ham and spam emails. The request is that I use conjugate gradient algorithm to estimate a parameter vector theta (that is the weights of words in emails). The problem is that dimension of the vector theta is equal the number of words in the training set that is a huge number (150,000). I am wondering if it is possible to use MATLAB optimization tool box for problems with variable of 150,000 dimensions. If it is impossible, is there any free optimization tool that I can use fo

error with intial conditions for ode45

Hi I have a problem in differentiating my equ. my .m file is function [t,xdot] = formdiffeq(t,XX,h,BB,A) x=zeros(1,6); y=zeros(1,6); d=zeros(6); s=zeros(6); l=zeros(6); k=zeros(1,6); %i use all these variables to calculate 'l' L=kron(l,eye(4)); xdot=A*XX+BB*L*(XX-h); end and in the command window I have calculated BB,h,A and the intial conditions as XX=[5;0;6;0;4;0;3;0;9;0;8;0;10;0;1;0;8;0;2;0;9;0;7;0]; [t,XX]=ode45(@formdiffeq,tspan,XX,[],h,BB,A); And the error i get is ??? Error using ==> odearguments at 116 FORMDIFFEQ returns a vector of length 1, but the length o

Pi approximation function optimization

I came across the "brain teaser" of finding the best approximation of pi by dividing one 9-digit number by another 9-digit number. Both numbers contain 1 through 9 once. I found a very close approximation by hand (728691345 / 231948765 = 3.141604763) but I want to know if there are any better ones. I've tried a couple different methods of writing a program to find a better approximation, but all I can come up with is a massive number of loops that would take way too long for my computer to process. I'll paste my current program below. If you can think of a better way to write this,

viewing structure arrays

I am trying to view my structure array but matlab just returns: str = 1x9 struct array with fields: name boss how can I see the values? Thanks

putting bodeplot() and raw data subplots in same plot

Hey everyone, I know about the bodeplot() command and how it automatically creates a bodeplot from a transfer function (with appropriate labeled axes and everything). However, is it possible to overlay another set of raw data (not a bodeplot) onto the 2 subplots of the figure that bodeplot creates? Basically, I have a bunch of x & y data for freq & phase (taken from an oscilloscope) that I can create a bode plot from using semilogx(), but i want to combine/overlay the two plots onto one figure. Also, can you use a for loop to make figures (I have a bunch of transfer functions I want to b

MATLAB GUI nyquist and Parabola HELP

Hi I'm a student and I'm creating a GUI program which incorporate teh 5 input responses plots in Control system, first the input is the numerator and the denominator of a transfer function. I'm having trouble with the Parabola response and also the nyquist diagram becuase the plot are not showing in the axes and the program stands still This is the code for the parabola response % --- Executes on button press in pushbutton13. function pushbutton13_Callback(hObject, eventdata, handles) % hObject handle to pushbutton13 (see GCBO) % eventdata reserved - to be defined in a future ver

How can I create my own workspace?

Hello, What I mean is, how can I transfer the workspace and all its variables (including loop counters and toc) from a nested function, for example, and make it available in another function?

parfor parameter sweep with function of big matrices

Hi all, I'm having issues regarding the use of parfor for a parameter sweep that uses large matrices. I have >> inds; %[huge x 3] matrix with each row being [x y z] coordinates into other matrices >>my_data = zeros(huge, 6, 'single'); original code >>for n = 1:length(inds) >> coords = inds(n.:); >> d = my_function(coords); >> my_data(n,:) = [d coords]; >>end my_function takes as inputs the coordinates into two approximately 900x900x900 uint8 matrices. I've been using global or appdata(set/getappdata(0,'I1')) to load the big matrices into my_function since passing them a

Question about dir

In my function, I'm using dir to create a structure of all my files in my current directory of a certain name. heres the code: matfiles=dir('*vo3*.mat'); %a structure containing all .mat files in current directory %that contain "vo3" ------ however, my problem is that I also have files in that directory that are under the naming convention of *vo3g*.mat. So I have files like *vo3*.mat and *vo3g*.mat But when i call my code shown above, it also includes the *vo3g*.mat files. Is there a way that I can use dir to only collect the *vo3*.mat files without collecting the othe

Duplicate points removed by DelaunayTri

After meshing with DelaunayTri, a few duplicate points are removed, however when I then get TriscatteredInterp the Data array no longer matches up with the XY values, and it fails. I'm sure I got around this before, but coming back to it now I haven't the foggiest idea how, suggestions? If its simplest I can try to figure out where those duplicate points are and deal with it prior to delaunaytri, or is there a way to match up the triangulation with the dataset afterwards?

Interfacing MATLAB and Visual Basic

How can I access a Visual Basic buffer using MATLAB? Actually, I am sending sampled data from an ADC to the PC via PIC microcontroller(PIC18F4550). This I am achieving through an application called EasyHID... Can I access EasyHID data directly from MATLAB? If not, EasyHID data can be accessed via Visual Basic...So if I can access Visual Basic data from MATLAB and operate on it(and send it back to Visual Basic,if possible...I guess I'm a little greedy!!), I'm done...So does anyone know how to interface MATLAB and Visual Basic?

define parameter limits using nlinfit

Hey Guys, I'm trying to conduct a fit of my measurements to the formula for the reflection coefficients: f=@(n1,t) abs(((sqrt(n1.^2 - (sin(t*pi/180)).^2) - cos(t*pi/180)).^2)/(1 - n1.^2)); %Fit-Funktion für r_senkrecht g=@(n2,t) abs((n2.^2*cos(t*pi/180)-sqrt(n2.^2-(sin(t*pi/180)).^2))/... (n2.^2*cos(t*pi/180)+sqrt(n2.^2-(sin(t*pi/180)).^2))); %Fit-Funktion für r_parallel unsing the following syntax: ns1=1.3; ns2=1.5; par_senk=nlinfit(x,y_senk,f,ns1); par_parr=nlinfit(x,y_parr,g,ns2); With funcion f evetrything's fine, bit with g MATLAB seems to experience problems due

Questions about Quiver

Hello, I am having trouble with my plot using quiver. For the vectors created by quiver, it starts at the coordinate indincated in quiver(x,y) and draw the vector toward the direction it should go. What if I want the coordinates to be the midpoint of the segment? so it has half of the line left of the coordinate given and half on the right. Is there a property I can change to achieve that? Thank you, Wilson

a 'stacked' 3D bar graph of a different kind

I have been struggling all morning to find the way to do this with MATLAB. I am creating 3D data of time, distance, and a whole number quantity. What makes up the quantity is the sum of 5 different catagories. I want to visualize the contribution of each of the categories similar to a stacked bar graph. but the bars rendered at different locations in the xy plane. This would be perfect. Next best I suppose is a surface but I don't understand how to demarkate contours to show contribution of the different categories to the total height. Is there a function or method/ examples for

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how to build a data file from excel file

Hi all, I have an exel file that contains a colomns values and i want to uses this data in my neural networks m-file. How can i call this excel file and how can i convert it to file with the form (file.data ). Thanks in advance David

errors in read dicom file

Dear all, When i tried to read dicom file to matlab I got the following error: '??? Error using ==> dicomread>newDicomread at 214 Unsupported data encoding.' I looked into the file by dicominfo and I found that the TransferSyntaxUID of such file is '1.3.46.670589.33.1.4.1' which is out of the definiation in matlab. I was wondering is there an alternative way to read the file to matlab. Thanks in advance. David

parameter constraint on crossCorr

dear all, I want to constrain the crossCorr function to return parameters/solutions between 0-1, because a priori I do not expect any negative relationships. Is there an easy way to do this that I am overlooking, thanks.

help in time series prediction by neural networks

Dear friends . I have gone through the manual of NN Toolbox but I found nothing about the use of neural networks for forecasting of univariate and multivariate time series. Could anybody tell me where can I find examples of this kind of applications? This is a new subject for me and I need to start with something simple. Best regards David

make controls invisible

Hello, I am working on a gui in which I have (among other things) a uipanel (which include a number of controls) Depending on the user input, this uipanel could be replaced by another, so I would like to make the uipanel invisible and make another visible. in VB it's object.visible=True or False. I search for a solution this this problem and I found only how to set a whole figure visible and invisible. I tried to imitate this method and I cam with set(uipanel3,'Visible','off') and set(findobj(gcf,'label','&uipanel3'),'visible','off') none of these did the job Please advi

Simulink Error!

Hi all... i've got some problems with Simulink variables. I try to explain my work: in input i've got a data(matrix) in matlab (latitude, long, altitude) then, after open Google Earth, with an embedded function, move the camera... I've just completed all my work with Matlab, all works fine... camera position, simulation... My next step then is to use Simulink. My problem is the seguent: i've got a function that take variables from matlab, constants for speed/focus point camera... and all works fine. Then i've to link all with a pack called My_GE_Camera and use a function called GE

Source file form stand alone GUI?

All, I spent quite a bit of time writing my first "real" standalone GUI using matlab. Unfortunately, my computer's hard drive crashed and I lost my source (.m) files I used to creat it. Is it possible to recover my .m files form my GUI. I found a back up of my compiled GUI but I have not been able to locate an up to date source file. am I toast?

for loop help

Could someone show a basic for loop that could produce the below results? L1.slope = [-59.3968 -56.9777 -54.7794 -51.587 -48.3138 -46.1093]; L1.int = [571.9502 566.8451 560.12 550.4008 539.3366 530.5057]; % LW is computed with above slope and intercept given measured windspeed. L1.a = L1.slope(1:1)*v+L1.int(1:1); L1.b = L1.slope(2:2)*v+L1.int(2:2); L1.c = L1.slope(3:3)*v+L1.int(3:3); L1.d = L1.slope(4:4)*v+L1.int(4:4); L1.e = L1.slope(5:5)*v+L1.int(5:5); L1.f = L1.slope(6:6)*v+L1.int(6:6); LW = [L1.a L1.b L1.c L1.d L1.e L1.f];

struct element as function input

Is there a way to assign struct elements as input into functions or is this just needless syntax? I guess the only benefit would be that instead of clearing each variable separately, one could just use "clear temp". %% Define the meter markings markings from the DTS - refer dr1 = 26; dc1 = 0; dr2 = 2093; dc2 = 0; temp.delim = '\t'; %% Run Fiber import function dts_meter.(sensor_id) = import_ORYX_dts_meter(path,temp.delim,dr1,dr2,dc1,dc2); clear dc1 dc2 dr1 dr2 temp ??? Error: File: import_ORYX_dts_meter.m Line: 5 Column: 53 Unexpected MATLAB operator.

help

hi all how can i ACQUIRE data form a hardware into the matlab? is matlab compatible to all hardware? if not in this case what shoul i do? sincerly rudrak

novice question

Hello I have this file that I would like to read: --------------------------------------------------------------------------------------------------------------------------------------------------------------------- 60 60 1200 2 ..4 0.02 0.1 0.9 0.1 10 2.1 1 .001 .001 8 8 1 1 5 40 8 1 1 6 5 1 1 1 1 0 10 2.1 1 .001 .001 6 6 1 1 5 60 10 1 1 6 5 1 1 1 1 0 Lx Ly Lz Nlayers Freq0 Serror Fimin Fmax Fstep h epsr miur etan mtan Nx Ny OverX OverY hmin hmax hn hp epsmin epsmax epsn epsp miumin miumax miun miup ------------------------------------------------------------------------------

GUI

Can I create a GUI and play it on a computer without MATLAB installed on to it?

3D Matrix access in Mex files

Hello, I have an issue I am not able to overcome. I want to create a mex file and pass to it a 3D double matrix representing an Image, for instance inputImage[480,640,3]. I cannot understand how to access the element of the matrix inside the mex files, I have tried everything with pointers with no results at all, it always returns me 0 or random numbers. If someone would be so gentle to help me, I will be really glad to him. Best Regards, Luca

Solving a 2-Compartment model in SimBiology

Hiya, I'm looking for a way to solve the following problem. I have data from two compartments, but don't know the transfer functions between them. They are rate limited. There is a bolus injection to the system and a sink. If the sink had an assumed rate, how would one go about getting the transfer coefficients between the two compartments? Would SimBiology be the best way to do this, if so can anyone provide examples / code to help? Thanks all

how to judge if an arc of a great circle crosses a quadrangle and calculate the positions of the intersects of on a sphere surface

The story below happens on Earth surface. There is an arc of a great circle (AB), the two endpoints of which are placed at (latA,lonA) and (latB, lonB). Beside, there is a quadrangle. The latitude and longitude of the four vertices (V1,V2,V3,V4) of the quadrangle are also known. The edges (e.g. V1V2,V2V4,...) of the quadrangle all lie on great cirles. Then, how can I know if the arc AB crosses the quadrangle and calculate their intersects?

problem with opening a *.fig file

Hello, I wrote a program with a GUI. I also made a button for saving the plots as a *.fig file. When I open the saved *.fig file, Matlab opens the import wizard (size= 1267x1894x3 and the class= uint8). When I click on the finish button the data is loaded in the workspace. The figure I saved was a polar plot. What can be the problem? The size of the matrix? Thanks Steven

plot a shape-preserving interpolant to XY

Dear all, I wish to fit and plot a shape-preserving interpolant line to my XY data points, and only display the fit on the plot - not the XY data. This is possible by first plotting the data and using a white maker, followed by basic fitting from the Tools menu. But what I am really after is a way of automating this step by building such a procedure into my own m-files. Generating an m-file from my figure results in an error messages that makes no sense to me: "pvpmod needs either a structure of a cell array with parameter/value pairs" I also tried to follow the help file on the

running time

Hi i have a formula i.e. T(t)=Ta+(To-Ta)exp(-A*t(time)) I want to use the actual simulation running time as t. All other values are constant. Can anybody help me how can i do that in C++ editor? Thanks in advance.

Get the name of the .mat file that I want to import from gui into the workspace

Hello! I have a GUI interface in which I put a button. When I push the button I am importing a .mat file using the command: uiimport('-file') Then I want to get somehow the name of the .mat file that I have imported, and I don't know how.... Can anyone help me with some tips? Thanks in advance! Alex

[Urjent help]how to draw box around detected object in runtime video from webcam?

Hi, i can working on a object detection project. I already finish the program to detect the object in still picture and mark it. Problem is how to do it in runtime video from a webcam. I know how to take a input form a webcam and show it, just not able to integrate two of those parts. If anyone know this solution please help!

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vibration analysis of sheller machine

Hello All, I am working with vibration analysis of sheller machine(a machine used in rice mills).I have to take the vibration data from this machine & its analysis part will be using data acquisition & signal processing tool box.I am using vibration sensors to take the machine vibration but i am having problem in inserting this data into matlab environment.How can i take this data through line in port into the analog input block of simulink.

Change length of legend line sample?

Is there any way in MATLAB to reduce the length of the line sample, as it is with i.e. Gnuplot (set key samplen 'sample length')? When I search in the product help I find examples for changing almost everything else, but can't find anything about this.

go back to a certain line within a script

is it possible to make matlab return to the start of the script. forexample my script will say please try again. at this point i would like it to go back to a certain line where the user will input. i tried to type run samemfile but i get an error. thankyou

Data manipulation in text file

Hi I have a text file as which I have to read and edit only a single or 2 columns and save it again with the same name.example 1 3 5 6 7 2 4 8 11 12 2 3 6 7 13 ........................ It goes like this for hundreds of columns. I need to read 3rd column only and subtract 1 from all the elements in that columns such that only that column is changed in new text file. I tried the command like this.. file1='C:\a1.txt' fileid=fopen(file1,'r') A=fscanf(fileid,'%f') (don't know the command here) file2='C:\anil\data_40.3125_-105.9375' ofid=fopen(file2,'w') fprintf(

Mahalanobis distance between 2 distributions

How can I calculate the Mahalanobis distance between 2 distributions given in matrices X & Y. The mahal.m command gives the distance for each observation (line of X) to the distribution Y and this is not what I want. I want to get the distance between the 2 distributions rather - any already implemented command or option in mahal.m that I overlooked ?