Sliced scalar assignment in parfor

The following code

    A=rand(10);

    parfor j=1:10

       A(:,j)=1; 

    end

gives me the following error

Error using test (line 5)
Subscripted assignment dimension mismatch.

Caused by:
    Subscripted assignment dimension mismatch.

It seems that you cannot do scalar assignment with parfor sliced variables? If not, is this documented somewhere? I know sliced variables must maintain a constant shape, but scalar assignment does not violate this.

Answer 1

[Edric Ellis]

Unfortunately, this is a limitation of PARFOR. The only workaround for MATLAB releases prior to R2019b is not to use scalar expansion like that. The limitation was removed in R2019b.

[Matt J]

Thanks, Edric. It's only for sliced variables, then? Temporary variables seem to do scalar expansion okay.

[Edric Ellis]

Yes, only sliced variables have the limitation.

[Edric Ellis]

Just updated this ancient answer because I just realised the limitation was removed ages ago...