I keep getting the error "Subscript indices must either be real positive integers or logicals." at the line where I try to define sys...what gives? % MEEG 4213 HW2.11 February 25, 2011 9:00 pm R. Leonard % This program calculates and plots the position of a car and its wheel % after the car hits a bump. After looking at graphs with different values % of b, it should be clear what a desirable damping coefficient would % be to give passengers a smooth ride. b = input('b value: '); % Allows user to designate damping coefficient tf = input('end time: '); % User-defined end-time of analysis (t0 = 0) ti = input('time increment: '); % User-defined time increment (sec) t = 0:ti:tf; % Definition of time array, t m1 = 10; % Mass 1 is 10 kg m2 = 350; % Mass 2 is 350 kg kw = 500000; % Spring constant of kw is 500000 N/m ks = 10000; % Spring constant of kw is 10000 N/m num = (kw*b/(m1*m2))*[1 ks/b]; % Numerator of equation 2.12 in book den = [1 (b/m1+b/m2) (ks/m1+ks/m2+kw/m1) (kw*b)/(m1*m2) kw*ks/(m1*m2)]; % Denominator of equation 2.12 in book...Note s^4 term, s^3 term, s^2 term, % s^1 term, and the constant. Spaces separate these terms. sys = tf(num,den); % MATLAB required internal definition of the 'system' y = step(sys, t); % Returns array data in y for each t value plot(t, y) % Plots the results title('HW2.11 Position of Car and Wheel After Hitting Bump') xvalue('time (s)') yvalue('position (m)')

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2/27/2011 9:06:29 PM

On 2/27/2011 3:06 PM, Rebecca wrote: > I keep getting the error "Subscript indices must either be real positive > integers or logicals." at the line where I try to define sys...what gives? .... > b = input('b value: '); % Allows user to designate damping coefficient > tf = input('end time: '); % User-defined end-time of analysis (t0 = 0) .... > sys = tf(num,den); % MATLAB required internal definition of the 'system' .... You've used tf as a ordinary variable, then either are trying to refer to an (thereby aliased) function of the same name or a 2D array instead (which is what Matlab thinks). Not enough data to tell what you intend but clear what confused Matlab. --

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2/27/2011 10:14:07 PM

"Rebecca" wrote in message <ikeecl$r5r$1@fred.mathworks.com>... > I keep getting the error "Subscript indices must either be real positive integers or logicals." at the line where I try to define sys...what gives? > > % MEEG 4213 HW2.11 February 25, 2011 9:00 pm R. Leonard > % This program calculates and plots the position of a car and its wheel > % after the car hits a bump. After looking at graphs with different values > % of b, it should be clear what a desirable damping coefficient would > % be to give passengers a smooth ride. > > b = input('b value: '); % Allows user to designate damping coefficient > tf = input('end time: '); % User-defined end-time of analysis (t0 = 0) > ti = input('time increment: '); % User-defined time increment (sec) > t = 0:ti:tf; % Definition of time array, t > m1 = 10; % Mass 1 is 10 kg > m2 = 350; % Mass 2 is 350 kg > kw = 500000; % Spring constant of kw is 500000 N/m > ks = 10000; % Spring constant of kw is 10000 N/m > num = (kw*b/(m1*m2))*[1 ks/b]; % Numerator of equation 2.12 in book > den = [1 (b/m1+b/m2) (ks/m1+ks/m2+kw/m1) (kw*b)/(m1*m2) kw*ks/(m1*m2)]; > % Denominator of equation 2.12 in book...Note s^4 term, s^3 term, s^2 term, > % s^1 term, and the constant. Spaces separate these terms. > sys = tf(num,den); % MATLAB required internal definition of the 'system' > y = step(sys, t); % Returns array data in y for each t value > plot(t, y) % Plots the results > title('HW2.11 Position of Car and Wheel After Hitting Bump') > xvalue('time (s)') > yvalue('position (m)')

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2/27/2011 10:21:21 PM

"Rebecca" wrote in message <ikeecl$r5r$1@fred.mathworks.com>... > I keep getting the error "Subscript indices must either be real positive integers or logicals." at the line where I try to define sys...what gives? > > % MEEG 4213 HW2.11 February 25, 2011 9:00 pm R. Leonard > % This program calculates and plots the position of a car and its wheel > % after the car hits a bump. After looking at graphs with different values > % of b, it should be clear what a desirable damping coefficient would > % be to give passengers a smooth ride. > > b = input('b value: '); % Allows user to designate damping coefficient > tf = input('end time: '); % User-defined end-time of analysis (t0 = 0) > ti = input('time increment: '); % User-defined time increment (sec) > t = 0:ti:tf; % Definition of time array, t > m1 = 10; % Mass 1 is 10 kg > m2 = 350; % Mass 2 is 350 kg > kw = 500000; % Spring constant of kw is 500000 N/m > ks = 10000; % Spring constant of kw is 10000 N/m > num = (kw*b/(m1*m2))*[1 ks/b]; % Numerator of equation 2.12 in book > den = [1 (b/m1+b/m2) (ks/m1+ks/m2+kw/m1) (kw*b)/(m1*m2) kw*ks/(m1*m2)]; > % Denominator of equation 2.12 in book...Note s^4 term, s^3 term, s^2 term, > % s^1 term, and the constant. Spaces separate these terms. > sys = tf(num,den); % MATLAB required internal definition of the 'system' > y = step(sys, t); % Returns array data in y for each t value > plot(t, y) % Plots the results > title('HW2.11 Position of Car and Wheel After Hitting Bump') > xvalue('time (s)') > yvalue('position (m)') You can't define a variable named tf and then try to call a function tf(). You've defined tf as a scalar. You should avoid naming variables the same as a MATLAB function, method, object, etc. Wayne

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2/27/2011 10:23:05 PM

sorry that book is this equation? num = (kw * b) / (m1 * m2) * [1 ks / b]; den = [1, (b/m2 b/m1 +), (+ kw/m1 ks/m2 ks/m1 +), (kw * b) / (m1 * m2), (kw * ks) / (m1 * m2)];

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4/2/2014 3:50:14 PM

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4/2/2014 3:55:11 PM

Dear all, Is there any way to calculate the correctness of the neural network results? Or if I explain the situation: I create a neural network using fitting tool, using input-output vectors. When I simulate the created network with only one input vector, I get an output but I don’t know if the output is correct or not. How can I calculate kind of error or correctness degree for the output of the simulated network? I hope I could voice what my problem is. Thanks in advance. "John " <onsekizdegilim@yahoo.co.uk> wrote in message news:ic6524$2i6$1@fr...

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I'm running VMS 7.3-2 on a cluster of two ES40 servers. Since moving to this configuration I've noticed that occasionally ( but not reliably reproducibly ) when a program exits I get the following error: %SYSTEM-F-ILLEGAL_SHADOW, illegal formed trap shadow, Imask=0111510C, Fmask=0000001B, summary=0B, PC=000000000000005B, PS=0000001B Improperly handled condition, image exit forced. Signal arguments: Number = 0000000000000003 Name = 00000000000005B4 000000000111510C 000000000000001B ...

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Hi all, When building an Mach-O target under Tiger, I get the following error: stdbool.h line 2 #error "stdbool.h has moved to avoid accidental use with a non-GCC compiler. Only GCC should have used stdbool.h due to licensing restrictions." When I looked at stdbool.h, all it has is the above error pragma. I did a preprocess on my .pch++ to see where stdbool.h is included, but honestly cannot find it. Any ideas for a work around? Best regards, -- Allen Cronce In article <1105552845.007378.311480@f14g2000cwb.googlegroups.com>, "Allen Cronce" ...

On trying to tar the files in my directory ( tar -cvf a.tar * ) ,I get the following error : "Wrote only 8192 of 10240 bytes tar: Error is not recoverable: exiting now" Please suggest the cause of the error no space left i guess... charlotte wrote: > On trying to tar the files in my directory ( tar -cvf a.tar * ) ,I > get the following error : > "Wrote only 8192 of 10240 bytes > tar: Error is not recoverable: exiting now" > Please suggest the cause of the error > Was there an a.tar in the directory before you issued this command? -- ced -- Ch...

This integral below give 0 on Mathematica 5.0 Integrate[Sqrt[R^2 - x^2], {x, -R, -R + d}, Assumptions -> R > 0 && d > 0 && d < 2R] This is a mistake I think, isn't it? Thanks, Baris Altunkaynak Hello ! Very interesting question ! As Integrate[Sqrt[r^2 - x^2], x] = (1/2)*(x*Sqrt[r^2 - x^2] + r^2*ArcTan[x/Sqrt[r^2 - x^2]]) you will have to use complex numbers using Newton-Leibnitz's formula with R<d<2R ! As (I suppose) you want to compute a surface under a circle, it is not good ! so I would suggest that you should ...

Dear Matlab Experts: Very weired error message showed during the execution of timer object. ------------------------------------------------------------------------- Error while evaluating TimerFcn for timer 'timer-1' Could not open file. ------------------------------------------------------------------------- Everything was perfectly fine, for the first 20 times execution of the callback TimerFcn, then suddenly an error poped out as above. What i do not understand is that why there is a limited number of execution for the timer's callback function. My code structur...

Hello I have Oracle 10G installed on linux red hat GNU i686 then started to get on the oracle alert.log a bunch of error messages "error 46 encountered when initializing ldm" Does anyone seem this before? or the fix Thanks Maria evoradba@yahoo.ca (Maria) wrote in message news:<351fd9d6.0410051730.7cdaf13b@posting.google.com>... > Hello > > I have Oracle 10G installed on linux red hat GNU i686 then started to > get on the oracle alert.log a bunch of error messages "error 46 > encountered when initializing ldm" > > Does anyone seem this before...

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Hi all, I'm new to AI and I would like to learn more about fuzzy logic, can someone send a short definition? and maybe some useful links that can help me start learning the fascinating world of AI? Thanks, Matti. ...

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What is wrong? .... (l_text)d += 1; *d = GetKey(App) & 0xFF; .... thanks flo -- Florian Xaver <http://www.flox.at.tf> Dr-DOS Wiki <http://www.drdos.org> SWORD - a nice GUI library for DOS/DJGPP <http://www.flox.at.tf> the cast transforms a lvalue into a rvalue Florian Xaver wrote: > What is wrong? > > ... > (l_text)d += 1; > *d = GetKey(App) & 0xFF; > ... > > thanks > flo "Florian Xaver" <wosrediinanatour@aon.at> wrote in message news:44670d4b$0$3880$91cee783@newsreader01.highway.telekom.at... > What is wr...

I am trying trap Runtime error 3022 (duplicates) in the click event of a command button that closes the form. I have code in the Form_Error event that does a good job of providing a more meaningful error message than the default. It works in every situation except when the user clicks the close button. I am using Me.Dirty=False to force a save but if there are duplicates I just get the standard Runtime 3022 error message. I am wondering why the Form_Error event is not triggered. Here are the two relevant subs: First the Form_Error Sub... Private Sub Form_Error(DataErr As Integer, Response ...

I am using English Windows 98 SE2 and Acrobat Reader 6/Adobe Asian Font Pack. I am able to read net based Chinese PDFs in both traditional and similified Chinese fonts. However, I have problems reading downloaded Chinese PDF Novels, e.g. http://hnbc.hpe.sh.cn/01/01B/20/M30a.pdf After opening the novel saved in my computer, few error messages would show: Msg upon the book is opened: "Found an unexpected operator in the display list." Moving into the text page: Cannot find or create the font "���^". Some characters may not display or print correctly ...