MATLAB: Correct use of uint32

Question

When I do the line

k = idx1* uint32(30e6) + idx2* uint32(0) + idx3* uint32(30e6);

I get an error "Integers can only be combined with integers of the same class, or scalar doubles." However, when I do:

idx1* uint32(30e6);

or

idx1* uint32(30e6) + idx2* uint32(0);

it works. Where am I going wrong? idx is a vector produced by:

idx1 = ( a < b )

where a and b are vectors.

Answer 1

Hi,

idx1 is a logical vector. So the error can be raised with:

logical(1)*uint32(2)

To get it working, cast idx1 to uint32:

uint32(logical(1))*uint32(2)
ans =
             2

So in your case:

k = uint32(idx1)* uint32(30e6) + uint32(idx2)* uint32(0) + uint32(idx3)* uint32(30e6);