Delete array elements with Coder compatibility

I need to delete elements of a string with compatibility for Coder. For example:

myStr = 'This is a fun problem!'
myStr(10) = '';

Now this works just fine in Matlab, but I get an 'The right and left hand sides must have the same number of elements' error when I try to use Coder at the 'Check for Issuse' stage. I realize that I could do the following,

myStr = 'This is a fun problem!'
myStr = myStr([1:9,11:numel(myStr)]);

but this is ugly and challenging because I am doing this as part of a loop where the indexes would get complicated quickly.

Any ideas? Thanks.

Answer 1

[David Hill]

myStr(10)=[];

[Michael]

Interesting. I originally coded this, but then changed it because I thought that Coder would see the [] input as a double and throw an error, as it would need a string. I tried this and it works though. Can you explain why this works? Why does passing [] work but passing '' does not?

[David Hill]

That syntax [] completely deletes the positions indicated. You can delete entire rows and columns also.

m=randi(100,10);
m(5,:)=[]
m(:,4)=[]

[Michael]

Interesting. I thought Coder would take issue with this, as I thought [] was an empty numeric array. Thanks for the help.

Answer 2

[Michael]

Figured out a solution. Redefine the string use logical indexing to select all but the element you want to exclude.

myStr = myStr(1:numel(myStr) ~= 10)