MATLAB: Logical Indexing Within a Symbolic Array

logical indexingsymbolic array

Suppose I have a symbolic array like
A = [0 0 0 w7 0 0;
0 0 0 0 w9 0;
0 w3 0 0 0 0;
0 0 w5 0 0 0;
w1 0 w6 w8 0 0;
w2 w4 0 0 w10 0];
where w1, …, w10 are symbolic real variables. I would like to generate a "binary" array which identifies where the symbolic variables w1, …, w10 are located, meaning that the output should be
A_bin = [0 0 0 1 0 0;
0 0 0 0 1 0;
0 1 0 0 0 0;
0 0 1 0 0 0;
1 0 1 1 0 0;
1 1 0 0 1 0];
Is there a way MATLAB could generate A_bin from A?
Thank you.

Best Answer

Try this
syms w1 w2 w3 w4 w5 w6 w7 w8 w9 w10
A = [0 0 0 w7 0 0;
     0 0 0 0 w9 0;
     0 w3 0 0 0 0;
     0 0 w5 0 0 0;
     w1 0 w6 w8 0 0;
     w2 w4 0 0 w10 0];
A_bin = ~isAlways(A==0)
or
A_bin = ~isnan(A./A)
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