Saving function variables to workspace.

Question

Shaunak Chandwadkar 2017-3-8

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https://ww2.mathworks.cn/matlabcentral/answers/328727-saving-function-variables-to-workspace

编辑： Stephen23 2019-5-25

hello, I have the following code

function [fitresult, gof] = createFit(time, load)
%CREATEFIT(TIME,LOAD)
%  Create a fit.
%
%  Data for 'untitled fit 1' fit:
%      X Input : time
%      Y Output: load
%  Output:
%      fitresult : a fit object representing the fit.
%      gof : structure with goodness-of fit info.
%
%  See also FIT, CFIT, SFIT.
%  Auto-generated by MATLAB on 08-Mar-2017 04:54:40
[Data] = xlsread('xyz.xls');
time1=Data(:,1);
load1=(Data(:,5));
[M,I] = max(load1(:));
tR=time1(I)+0.01;
k=0.0025;
R=2.5e-06;
x0=[2e6 4e6 1e7];
% load=(Data(:,5))*0.00980665; 
%%Fit: .
[xData, yData] = prepareCurveData( time1, load1 );
% Set up fittype and options.
ft = fittype( '(((8*sqrt(R)*((k)^(3/2))*(sqrt(tR))*E1)./(2*((E1+E2)^2))).*((E2*(E1+E2).*tR)-(((E1.*eta*(exp(-(E1+E2).*time./eta)))*((-exp((E1+E2)*tR/eta))+1)))));', 'independent', 'time', 'dependent', 'y' );
opts = fitoptions( 'Method', 'NonlinearLeastSquares' );
opts.Algorithm = 'Trust-Region';
opts.Display = 'Off';
opts.Lower = [-1e2 -1e2 k -1e2 R tR];
opts.MaxFunEvals = 5000;
opts.MaxIter = 5000;
opts.StartPoint = [x0(1) x0(2) k x0(3) R tR];
opts.TolFun = 1e-12;
opts.TolX = 1e-12;
opts.Upper = [1e11 1e11 k 1e11 R tR];
% Fit model to data.
[fitresult, gof] = fit( xData, yData, ft, opts );
% Plot fit with data.
figure( 'Name', 'Best Fit' );
h = plot(fitresult,'-r', xData, yData,'-b' );
legend( h, 'load vs. time', 'Best Fit', 'Location', 'NorthEast' );
% Label axes
xlabel Time
ylabel Load
grid on
end

How can I save the results in the workspace to write them to a excel file using xlswrite, The variables don't show up in workspace. Making them global isn't working. Generated this code using curve fit toolbox. Thanks in advance.

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Answer 1

Guillaume 2017-3-8

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在 MATLAB Online 中打开

Assuming that "the results" is the fitresult outputput, simply call your function by giving it an output (the same way you get results from standard matlab functions, by the way)

>>fitresult = createFit(something, somethingelse);

fitresult will then be in the workspace of the caller, so if you call it from the command line, it'll be in the base workspace.

If by "the result" you mean some other variables such as xData, then you need to change the function prototype to tell it to return the value. E.g. for xData, change the function to:

function [fitresult, gof, xData] = createFit(time, load)

You would then call it with:

[fitresult, ~, xData] = createFit(something, somethingelse);  %~ to ignore second output

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Shaunak Chandwadkar 2017-3-8

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Thanks Guillaume for the help, I gave it a try but, it did not work fore me. I guess its because I am trying to access

fitresult.E1

Which is in CFIT format.

Guillaume 2017-3-8

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The first output returned by createFit will always be an object of class cfit that matches your fit model. So the property E1 should always be defined.

So if it does not work, what is the exact error message and what does

class(fitresult)

return?

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Answer 2

Mohan Gopal Tripathi 2019-5-24

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Try using Debugger, when the step passes your "[fitresult, gof] = fit( xData, yData, ft, opts );", at that time it will create a variable gof with all information. But due to some reason it will not remain in workspace for ever. Either you create a variable and save it at that point, or just stop the step and see the details.

I also went through the same problem, and this is the way to get details of gof.

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Stephen23 2019-5-25

编辑：Stephen23 2019-5-25

"Either you create a variable and save it at that point, or just stop the step and see the details."

Those are fine if you a) want to save the variable OR b) are debugging your code. Otherwise you can just use the simple solution that Guillaume gave two years ago: specify that variable as an output argument AND then call the function with the appropriate number of outputs.

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