Logical Indexing Within a Symbolic Array

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Kamal Premaratne
Kamal Premaratne 2020-12-30
评论： Ameer Hamza 2020-12-30
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.

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采纳的回答

Ameer Hamza
Ameer Hamza 2020-12-30
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)

更多回答（1 个）

Walter Roberson
Walter Roberson 2020-12-30
~isSymType(A, 'constant')

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