ERROR for Matrix dimensions must agree.

Hello 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=(σ1-σ3)

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);

err= ((A1-A2)./A1)*100;

display(err,'error %');

end

when I type stress5_function([1115 1116],[0.3 0.4], [2.7 2.8], [22 23],[1.11 1.8],[2.677 4.462],[30.9 50],[0.97 1.5]) the error occur.

 I can do the function with a set of parameter but can't do it with two

Matrix dimensions must agree.

Error in stress5_function (line 9)

Et=Ei.*(1-(Rf.*z)./(S0+k.*exp(-(S3./m))));

Can anyone please help !!! Thanks a lot!!!!

Answer 1

[Robert]

Your variable z is not the same size as Rf, which matches the size of your inputs. The element-wise multiplication is happy to expand your scalars when you multiply by z but cannot do the same when you input vectors.

[Coleman]

so can you give me some suggestions to fix the problem??