"Error using /. Matrix Dimensions must agree." (Tried both / and ./)

Not sure why I am getting this error. I read through the explanation that the Matlab helper gives you, but I am still confused. Here is my code so far:

>> d31=-320e-12;

>> Yp=62e9;

>> Yfca=250e9;

>> vp=0.5;

>>a=linspace(0,1);

>> d31eff=-d31./(log(1-a)*((1/a)-0.5))

Error using /

Matrix dimensions must agree.

I am very new to Matlab so any additional details are welcomed. Thank you!

[Stephen23]

a has 100 elements. What do you expect 1/a to return? You need:

1./a

[Torsten]

d31eff = -d31 ./ ( log(1-a) .* (1./a - 0.5) )

instead of

d31eff=-d31./(log(1-a)*((1/a)-0.5))

Answer 1

[Navya Singam]

Hi Luis,

Changing this line of code wil resolve the issue.

d31eff=-d31./(log(1-a)*((1/a)-0.5))

to

d31eff=-d31./(log(1-a).*((1./a)-0.5));

You can refer to the following documenatations to understand more on the array operations and rdivide.

Array vs. Matrix Operations - MATLAB & Simulink (mathworks.com)

Right array division - MATLAB rdivide ./ (mathworks.com)