I am new to python so apologies for the ignorance with this question. How would I apply a line of best fit to a plot? My data are netCDF4 data files and this is essentially what I have done so far: swh1=netCDF4.Dataset('filename','r') hs1=swh1.variables['hs'] swh2=netCDF4.Dataset('filename'.'r') hs2=swh2.variables['hs'] plt.plot(hs1,hs2,'.') Cheers, Jamie

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3/31/2014 11:29:15 AM

--001a113a6020e6901104f5e5a9f1 Content-Type: text/plain; charset=UTF-8 None of these are in the standard library but why re-invent the wheel? Using numpy: http://docs.scipy.org/doc/numpy/reference/generated/numpy.polyfit.html scipy: http://docs.scipy.org/doc/scipy-0.13.0/reference/generated/scipy.stats.linregress.html statsmodels: http://statsmodels.sourceforge.net/devel/examples/notebooks/generated/ols.html On Mon, Mar 31, 2014 at 1:29 PM, Jamie Mitchell <jamiemitchell1604@gmail.com > wrote: > I am new to python so apologies for the ignorance with this question. > > How would I apply a line of best fit to a plot? > > My data are netCDF4 data files and this is essentially what I have done so > far: > > swh1=netCDF4.Dataset('filename','r') > hs1=swh1.variables['hs'] > > swh2=netCDF4.Dataset('filename'.'r') > hs2=swh2.variables['hs'] > > plt.plot(hs1,hs2,'.') > > Cheers, > > Jamie > -- > https://mail.python.org/mailman/listinfo/python-list > --001a113a6020e6901104f5e5a9f1 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr">None of these are in the standard library but why re-inven= t the wheel?<br><br>Using numpy:<br><a href=3D"http://docs.scipy.org/doc/nu= mpy/reference/generated/numpy.polyfit.html">http://docs.scipy.org/doc/numpy= /reference/generated/numpy.polyfit.html</a><br> <br>scipy:<br><a href=3D"http://docs.scipy.org/doc/scipy-0.13.0/reference/g= enerated/scipy.stats.linregress.html">http://docs.scipy.org/doc/scipy-0.13.= 0/reference/generated/scipy.stats.linregress.html</a><br><br>statsmodels:<b= r> <a href=3D"http://statsmodels.sourceforge.net/devel/examples/notebooks/gene= rated/ols.html">http://statsmodels.sourceforge.net/devel/examples/notebooks= /generated/ols.html</a><br></div><div class=3D"gmail_extra"><br><br><div cl= ass=3D"gmail_quote"> On Mon, Mar 31, 2014 at 1:29 PM, Jamie Mitchell <span dir=3D"ltr"><<a hr= ef=3D"mailto:jamiemitchell1604@gmail.com" target=3D"_blank">jamiemitchell16= 04@gmail.com</a>></span> wrote:<br><blockquote class=3D"gmail_quote" sty= le=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> I am new to python so apologies for the ignorance with this question.<br> <br> How would I apply a line of best fit to a plot?<br> <br> My data are netCDF4 data files and this is essentially what I have done so = far:<br> <br> swh1=3DnetCDF4.Dataset('filename','r')<br> hs1=3Dswh1.variables['hs']<br> <br> swh2=3DnetCDF4.Dataset('filename'.'r')<br> hs2=3Dswh2.variables['hs']<br> <br> plt.plot(hs1,hs2,'.')<br> <br> Cheers,<br> <br> Jamie<br> <span class=3D"HOEnZb"><font color=3D"#888888">--<br> <a href=3D"https://mail.python.org/mailman/listinfo/python-list" target=3D"= _blank">https://mail.python.org/mailman/listinfo/python-list</a><br> </font></span></blockquote></div><br></div> --001a113a6020e6901104f5e5a9f1--

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3/31/2014 11:50:53 AM

In article <0fb15100-15e8-46d6-a38f-b187c7012e62@googlegroups.com>, Jamie Mitchell <jamiemitchell1604@gmail.com> wrote: > I am new to python so apologies for the ignorance with this question. > > How would I apply a line of best fit to a plot? Python has nothing built-in which does that, but there are plenty of add-on modules which do those sorts of things. One popular one is statsmodels (http://statsmodels.sourceforge.net/) > plt.plot(hs1,hs2,'.') Please tell us more about the environment you're working in. I'm guessing from the fact that you're calling plt.plot(), that you've already got some add-on modules loaded. Pandas, maybe?

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3/31/2014 12:21:48 PM

Roy Smith <roy@panix.com> wrote: > Please tell us more about the environment you're working in. I'm > guessing from the fact that you're calling plt.plot(), that you've > already got some add-on modules loaded. Pandas, maybe? Probably matplotlib.pyplot

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4/1/2014 12:44:33 AM

On Mon, 31 Mar 2014 04:29:15 -0700, Jamie Mitchell wrote: > I am new to python so apologies for the ignorance with this question. > > How would I apply a line of best fit to a plot? That depends on what software you are using to generate the plot. I see you have this line of code: > plt.plot(hs1,hs2,'.') but you haven't told us what plt is, where it comes from, or anything needed for us to answer your question. So, start by telling us what plt is, and we may be able to tell you whether or not it supports lines of best fit. -- Steven D'Aprano http://import-that.dreamwidth.org/

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4/1/2014 1:00:52 AM

Hi, I am new to using GNUPLOT and am trying to find the best fit line (to determine the slope) of a line that follows Power Law (is an exponential line). I realize I have to use a function f(x) = a*b**x. But, I do not know what to do next. Any help in this matter would be greatly appreciated. Thanks, Divya Divya Rao <divyarao09@yahoo.com> wrote: > Hi, > I am new to using GNUPLOT and am trying to find the best fit line (to > determine the slope) of a line that follows Power Law (is an > exponential line). First, a terminology issue: an exponential curv...

Hi. Is there a function to calculate/plot the best fit line given a few (approx 3) points? I don't have any toolboxes, nor can I afford any. Can any function in the basic matlab application do this? Thanks! "Amir " <amirschricker.DELETE@DELETE.gmail.DELETE.com> wrote in message <g4o8va$aa7$1@fred.mathworks.com>... > Hi. Is there a function to calculate/plot the best fit line > given a few (approx 3) points? I don't have any toolboxes, > nor can I afford any. > > Can any function in the basic matlab application do this? Yes. help polyfit J...

Hello, I have a problem that is puzzling me for very long.I got this problem of fitting in 80 over text files and within each txt file,it contains about 120 datas.I want to from these datas generate a best fit line to cut through all these points.The program I am now using is Matlab.Please help and reply asap,as I need the info urgently. Thanks. In article <a488ubsdofj7@legacy>, kellyblue19@yahoo.com (Eid) writes: >Hello, > I have a problem that is puzzling me for very long.I got this >problem of fitting in 80 over text files and within each t...

Any ideas on what to do? Stop attempting to negotiate. Contact your state insurance commission. Be prepared to divulge the name of your insurer. Keep detailed records of all your contacts. ----- - gpsman website--> http://www.win2job.info/ ...

I have two vectors and plotted them using a stem graph. I want to find the line of best fit and display this on the graph. I know about the function polyfit, but how do I graph its output? Look at help polyval cheers Peter wrote: > > > I have two vectors and plotted them using a stem graph. I want to > find the line of best fit and display this on the graph. I know > about > the function polyfit, but how do I graph its output? ...

Hello All: I am trying to compare an observed dataset with best-fit models for: 1) Power Law 2) Exponential 3) Exponential Truncated Power Law I am able to get these four datasets (observed data + 3 models). But now I wish to see which of the models fits the dataset the best. It seems MATLAB AIC will only fit your data to built-in models, and not these 3 models I approximated myself. Any suggestions for procedures (whether or not they use MATLAB or AIC) will be very helpful!! Thank you. Jo PS: The datasets are not the same size (i.e. observed x=50 points, y=50 points. models x=1030 poi...

At the moment I am writing code to find the weighted line of best fit. I can calculate the line of best fit using the code given below, where sortWLAN corresponds to the entries in an array, which I want to extract. onedist = sortWLAN(3,1:100); onerssi = sortWLAN(4,1:100); onewgt = sortWLAN(5,1:100); coeffs = polyfit(onedist,onerssi, coefficient); curvefit = polyval(coeffs, distance); hold on plot(onedist, onerssi, 'o'); plot(distance,curvefit, 'r'); hold off Anybode have any ideas? Cheers Brad wrote: > At the moment I am writing code to find the weighted line of best &...

Hi guys, I have an issue I'd like some help with. coordinates = 107.35 107 111.51 146 117 154.61 111.29 114 In the above matrix 'coordinates', its actually in the form [ x1 y1 x2 y2] for each of the 2 rows. Is there any function I can obtain a best fit line using these 4 points? thanks Kurtis Go look up the demo on the function polyfit, u can tell it to make a first order regression of those...

I have a set of data in an array (11000,207). I've been asked to detrend the data in each of the 207 columns individually. I've tried using the Matlab detrend but I cant get it to work in a sensible way for this data. Instead I've been trying to ouput the equation for a line of best fit for the data in each column and then subtract that from the data. Seems a simple task but the only way I have found to find a line of best fit is doing it manually once you have a figure up using the best fitting option in tools. Obviously I don't want to do this manually 207 times. Does any...

I have a matrix simular to the one below: 1 2 2 3 3 4 4 5 5 6 6 7 7 8 Is there a command that will give me an equation for a line of best fit for these data points? Thanks On Sep 27, 4:16=A0pm, "Charles " <charles.vaug...@colorado.edu> wrote: > I have a matrix simular to the one below: > > =A0 =A0 =A01 =A0 =A0 2 > =A0 =A0 =A02 =A0 =A0 3 > =A0 =A0 =A03 =A0 =A0 4 > =A0 =A0 =A04 =A0 =A0 5 > =A0 =A0 =A05 =A0 =A0 6 > =A0 =A0 =A06 =A0 =A0 7 > =A0 =A0 =A07 =A0 =A0 8 > > Is there a comm...

I want to add a linear trendline in both the plots of subplot. How do i do this, when i do this using the basic fitting option from the tools menu of figure, the line appears only for one data set ata time, i want to do it for both the data sets. You're right, it doesn't seem possible to do it with the Basic Fitting tool. I guess you have to do it by hand, like this: %%%%% x=[0:0.005:1.5]; %curve 1 y=sin(x); %linear fit 1 p = polyfit(x,y,1) y_lin = polyval(p,x); %curve 2 z=cos(x); %linear fit 2 p = polyfit(x,z,1) z_lin = polyval(p,x); %plot subplot(1,2,1) h(1)=plot(x,y) hold on h(2)=...

Hi everyone., The following code reads an image, allows user to select an ROI and then the intention is to select 1000 points randomly in the ROI and generate a best fit line through these points. By inserting breakpoints i see that the points generated randomly lie in the range of points belonging to the ROI. So, it seems there is no problem at this stage.I am not able to identify where else there is an error. Pls help. Thanx in advance. clc; close all; clear all; %WHEN USING THE IMAGE MAKE SURE THAT BW AND BW1 DO NOY HAVE TOO MANY ELEMENTS, IF THEY DO CROP BW AND BWI AND USE THE CROPPED...

Good afternoon, I am having trouble trying to figure out how to fit a nonlinear best fit line to my data in SAS. Any help would be greatly appreciated. Regards, Ligia ...

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