column multiplication by specific number with some condition

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Nazar Tarlanli
Nazar Tarlanli 2018-11-14
评论： madhan ravi 2018-11-15
r = -5 + (5+5)*rand(10,1) % column with positive and negative numbers
I want to create the function r_1 by satisfying the following:
r_1= r .* 0.5 if r >0
and
r_1 = r .* 0.7 if r<0
I guess, I should multiply positive values by 0.5 and negative values by 0.7.

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回答（1 个）

madhan ravi
madhan ravi 2018-11-15
编辑：madhan ravi 2018-11-15
r_1=ones(1,numel(r)):
r_1(r>0)=r(r>0).*.5;
r_1(r<0)=r(r<0).*.7;
r_1

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