Re: logical indexing shortcut?

[Carlo de Falco]

> On 3 Sep 2017, at 18:11, Peter P. <address@hidden> wrote:
> 
> Addon to my prevous posting below:
> 
> * Peter P. <address@hidden> [2017-09-03 18:02]:
>> Hi list,
>> 
>> I am looking for a way to operate on certain elements of a vector using
>> logical indexing. I want to multiply all elements in x that are integer
>> multiples of four by the number 5.
>> 
>> x = [3 15 9 12 -1 0 -12 9 6 1];
>> b = rem(x, 4)==0;
>> x(b) = x(b)*5
>> 
>> I wonder if there is a way to do it in one step, without creating index
>> vector b?
> and without calculating the condition twice, as in
> x(rem(x, 4)==0) = x(rem(x, 4)==0) * 5

x(rem(x, 4)==0) *=  5

> thanks,
> P
c.