Matlab error "Matrix dimensions must agree"
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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);
采纳的回答
Star Strider
2020-5-28
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.
更多回答（1 个）
Clemens Dierks
2020-11-5
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
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