Storing the output of spap2 into an array then looping and graphing that output

Question

Moustafa El-sawy 2016-7-4

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https://ww2.mathworks.cn/matlabcentral/answers/293685-storing-the-output-of-spap2-into-an-array-then-looping-and-graphing-that-output

回答： Unai San Miguel 2016-9-29

Basically I have a matrix of data that I am trying to curve fit. I am using the spap2 function. Since I have an array of data that I am looping through and for each iteration I am trying to store the output of spap2 into an array so that I can graph that array later on in another loop.

The problem can be split into two parts: 1) Storing the output of spap2 into an array. 2) Looping through the array with the spap2 functions and graphing each iteration (with a 0.5 seconds pause between each graph) to produce a "dynamic graph" that changes with time!

Your help is greatly appreciated.

Sample of code I am using is below:

for counter = 1:limit
      curv = curvature(counter,:);                                                % Curvature of this iterations                                                                         
      moment = curv.*(E*I);
      LOC = -flip(locations);
      Ycurv = flip(curv);
      Ymoment = flip(moment);
      W = flip(w);
      sp = spap2(1, k , LOC, Ycurv , W);
      sp2 = spap2 (1, k , LOC , Ymoment, W);
      theta = fnint(sp);
      deflectionarray(counter,1) = fnint(theta);
      momentarray(counter,1) = sp2;
      shear = fnder(sp2);
      soilrctnarray(counter,1) = fnder(shear);
end

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Walter Roberson 2016-7-4

Looks like CurveFitting

Moustafa El-sawy 2016-7-5

Its one of the curvefitting functions.

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Answer 1

Unai San Miguel 2016-9-29

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/293685-storing-the-output-of-spap2-into-an-array-then-looping-and-graphing-that-output#answer_236647

在 MATLAB Online 中打开

The output of spap2 is a struct, something like:

   >>sp
   sp = 
     form: 'B-'
    knots: [1x25 double]
   ...

Maybe this is not what you would like to use in a dynamic plot. You could instead use fnplt(sp) in every step, or pts = fnplt(sp); plot(pts(1,:), pts(2,:)), ...