Matlab error "Matrix dimensions must agree"

I'm trying to get the integral() of a two functions but I keep getting this error and I don't know why

This is the code for the functions:

R = 0.5; %m
I = 2; %A
u0 = 4*pi*10^-7;

BiotSavart = (u0*R*I)/(4*pi);

max = 50;

px = -R:R/max:R;
py = -R:R/max:R;
pz = 0:R/max:2*R;

fy = @(t) sin(t)./((px-R*cos(t)).^2+(py-R*sin(t)).^2+pz.^2).^(3/2);
fz = @(t) (R-py.*sin(t)-px.*cos(t))./((px-R*cos(t)).^2+(py-R*sin(t)).^2+pz.^2).^(3/2);

By = pz * BiotSavart * integral(fy,0,2*pi);
Bz = BiotSavart * integral(fz,0,2*pi);

I get the error in this line:

fy = @(t) sin(t)./((px-R*cos(t)).^2+(py-R*sin(t)).^2+pz.^2).^(3/2);

Answer 1

[Star Strider]

Integrating an array, set 'ArrayValued' to 'true':

By = pz .* BiotSavart .* integral(fy,0,2*pi, 'ArrayValued',1);
Bz = BiotSavart * integral(fz,0,2*pi, 'ArrayValued',1);

That runs without error.

[Andrés Olvera]

That worked, thanks! :D

[Star Strider]

As always, my pleasure!

Answer 2

[Clemens Dierks]

Hello everybody,

I have the same error in a different situation.

I wrote the function to save two variables (matrices) in a xlsx file within two sheets.

Because xlswrite seems to be deprecated I used 'writematrix'.

A is 9000x2 matrix.

B is 1x1 vector.

The error occurs in when calling the method "writematrix".

Thank you in advance! :)

This is my code:

function [] = save_data(filename, A, B) 
           save(filename,'solution','DBC10'); 
           writematrix(A, strcat(filename+'.xlsx'), 'sheet', 1)
           writecell(B, strcat(filename+'.xlsx'),'sheet', 2)
end