for loop for the function

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Coleman 2016-2-24

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关闭： MATLAB Answer Bot 2021-8-20

Hi all, here is my function

function [error] =stress5_function(Ke,n,Sult,u,t,S0,k,m)
pa=0.1013 ;
S3=5 ;
Ei=Ke.*pa.*(S3./pa).^n;
Rf=(S0+k.*exp(-(S3./m)))./(Sult+u.*exp(-(S3./t)));
% z=(£m1-£m3)
z=0:0.0001:5;
Et=Ei.*(1-(Rf.*z)./(S0+k.*exp(-(S3./m))));
Et(Et<0)=0;
x=(z./Et).*100;
A=xlsread('5MPa','A1:A32');
B=A';
C=xlsread('5MPa','B1:B32');
D=C';
startingIndex = find(x==0);
endingIndex = find(x>=16);
desiredX = x(startingIndex:endingIndex);
desiredZ = z(startingIndex:endingIndex);
A1 = trapz(desiredX,desiredZ);
A2= trapz(B,D);
error= ((A1-A2)./A1)*100;
end

there are 8 parameters in the function and the value of the parameters, I stored in an excel file

Ke=xlsread('parameters','A2:A9096');
n=xlsread('parameters','B2:B9096');
Sult=xlsread('parameters','C2:C9096');
u=xlsread('parameters','D2:D9096');
t=xlsread('parameters','E2:E9096');
S0=xlsread('parameters','F2:F9096');
k=xlsread('parameters','G2:G9096');
m=xlsread('parameters','H2:H9096');
pa=0.1013 ;
S3=5 ;

I want to create a for loop to run the function what should I write??

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Stephen23 2016-2-24

Do NOT call any variable or function error, because then you stop the very important inbuilt function error from working properly. For the same reason you should never name any variable or function size, length, cell, table, i, j, etc.

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Answer 1

Jan 2016-2-24

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https://ww2.mathworks.cn/matlabcentral/answers/269809-for-loop-for-the-function#answer_211093

编辑：Jan 2016-2-25

在 MATLAB Online 中打开

Your funtion accepts vectors as input. So there is no need to call it through a for loop. But if you really want to do this:

err = zeros(size(Ke));
for i = 1:numel(Ke)
  err(i) = stress5_function(Ke(i),n(i),Sult(i),u(i),t(i),S0(i),k(i),m(i));
end

Better read the 5MPa file once only and provide the contents as inputs:

B = xlsread('5MPa','A1:A32').';
D = xlsread('5MPa','B1:B32').';

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Coleman 2016-2-25

Thanks Jan ! But then when I run the function I got all my answer -inf and I don't know why....

Jan 2016-2-25

编辑：Jan 2016-2-25

Use the debugger to step throught your code line by line, until you find the reason for the unexpected values. Please note, that we cannot do this for you, because we do not have the input data and cannot guess, why you assume a vlue different from Inf.

for loop for the function

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