Is there a way to change a vector range by condition?

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maxmathlab
maxmathlab 2016-10-12
编辑： Andrei Bobrov 2016-10-12
Hallo,
i use a simple example for my problem:
i have a vector
x=[-10:10];
x=x';
Now i want to change values of the range 5:15 which are positive. i tried something like this:
x(5:15 & x>0,1)=100
x( (5:15) & (x>0) ,1)=100
x(5:15,1)&x>0=100
x(x(5:15)<0,1)=100
nothing seems to work. pls help.

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采纳的回答

Andrei Bobrov
Andrei Bobrov 2016-10-12
编辑：Andrei Bobrov 2016-10-12
x=(-10:10)';
z = x(5:15);
z(z>0) = 100;
x(5:15) = z;
or
x=(-10:10)';
b = false(size(x));
b(5:15) = true;
x(b & x > 0) = 100;
or in one row
x(intersect(find(x>0),5:15)) = 100;

更多回答（1 个）

KSSV
KSSV 2016-10-12
If you want to change values at known indices use:
x(5:15)=100;
If you want to change values according to the values of x use:
x(x>1)=100;
x(x>1 & x<2)=100;
  1 个评论
maxmathlab
maxmathlab 2016-10-12
编辑：maxmathlab 2016-10-12
i know matlab this far. but how do i combind it?
for e.g.: if i want to change my vector x from x(5) to x(15) but also only negativ values, what would the command look like?

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