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How to modify table elements without using a for loop?

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Elissa
Elissa 2018-11-4
评论： Peter Perkins 2018-11-6
E.g.
% t is a table
for (yy = 1:size(t,1))
if strcmp('cat',t.animal(yy))
t.value(yy) = t.value(yy)*-1;
end
end

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Stephen23
Stephen23 2018-11-4
编辑：Stephen23 2018-11-4
Your original idea of using strcmp was perfect, there is no need to complicate things with strings:
value = [1;2;3;4]
animal = {'cat';'dog';'cat';'dog'}
t = table(value,animal)
idx = strcmp(t.animal,'cat')
t.value(idx) = -t.value(idx)
  2 个评论
Peter Perkins
Peter Perkins 2018-11-6
One addition to Stephen's sol'n: if animal is representative of what your actual data look like, you should consider using a categorical variable. You would then change one line
idx = (t.animal == 'cat');
but also you might find working with that variable elsewhere much simpler.

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