Matrix operations

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Papa Orgen
Papa Orgen 2011-7-25
i have an n by i matrix call it B. I want to apply two different operations to B. I want to perform the first operation on elements of B<0 and then perform the other operation to the rest of B. The operations themselves are n by n matrices. How do i do it please?

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回答（1 个）

Titus Edelhofer
Titus Edelhofer 2011-7-25
Hi,
use logical indexing:
idx = B<0;
% operate on these indices:
B(idx) = ...;
% and now on those >= 0:
B(~idx) = ...;
Titus

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