Matrix multiplication with logical values error

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Camilo A.
Camilo A. el 31 de Oct. de 2016
Editada: Massimo Zanetti el 31 de Oct. de 2016
I have this matrix:
M =
0 3 0 0
0 2 0 0
2 0 3 4
0 4 0 2
And I call these vectors:
I=~(any(3==M'))', J=~any(3==M)
I =
0
1
0
1
J =
1 0 0 1
Why I cant multiplicate "I*J"? And how can I fix it?
I*J
Error using *
Both logical inputs must be scalar.
To compute elementwise TIMES, use TIMES (.*) instead.
I want this result:
ans =
0 0 0 0
1 0 0 1
0 0 0 0
1 0 0 1
Thanks

Respuesta aceptada

Massimo Zanetti
Massimo Zanetti el 31 de Oct. de 2016
Editada: Massimo Zanetti el 31 de Oct. de 2016
For logical matrices matrix multiplication doesn't apply (because it is not logical operation). To get your Dyadic product, cast to double:
dyd = double(I)*double(J)
NOTE: matrix product is not fully supported for integer classes in MATLAB, so casting to integer types (to save memory) won't work too..

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