Implicit matrix expansion correction

I have the following line of code (running in Matlab2016b), but which shows up with a "matrix dimensions must agree" error in Matlab2015a. How would I correct it? Thank you!

a=reshape(a(a ~= b(:,2)'),[],c);

Answer 1

[Guillaume]

It would have been helpful if you'd provided more details such as the size of a, b and c. Most likely,

a = reshape(a(bsxfun(@ne, a, b(:, 2)'), [], c);

would solve the problem. If not, provide more details.

While you're at it rename these extremely meaningless variable names to something a lot more meaningful.

[Garima Sharma]

Thank you. a is 11x21, b(:,2)' is 1x21, and c is 21.

Answer 2

[VBBV]

a = rand(11,21);
b = rand(21,1);
c = 21
a = reshape(a(a~=b.'),[],c)

There is no error with your code. Maybe it's version issue or check with any symbolic variables are present inside your a or b matrices.

[Stephen23]

"There is no error with your code. Maybe it's version issue..."

Implicit dimension expansion was introduced in R2016b:

https://blogs.mathworks.com/loren/2016/10/24/matlab-arithmetic-expands-in-r2016b

The OP states that they were comparing R2016b with R2015a (which throws an error).