Re: set array values from 3 vectors

[Przemek Klosowski]

On 08/30/2011 11:12 AM, Andy Buckle wrote:
> On 30 August 2011 11:25, carbonmetrics<address@hidden>  wrote:
> > I have a canvas=zeros(1000,365), in which 1000=number of projects and
> > 365=days of the year,
> > a startdate and an enddate vector, and a value vector.
> >
> > what i would like to do is to place the values [value vector] in the canvas
> > array,
> > where the indices are>  startdate and<  enddate.
> >
> > if the canvas would be a vector, and the value a scalar then
> > 'canvas(startdate:enddate)=value' would do the job.
> >
> > I can't get it done doing a loop, but of course I would much rather
> > vectorize the code.
> >
> > It looks like a frequent question, but I could not find anything on this,
> > does anybody have an idea?
> >
> > Thanks!
> > Henk
>
> It's probably just me being slow. I don't quite get it.
>
> Could you write a short script that is self-contained, and does what
> you want? It can be slow and loopy. Then it is easier for anyone
> trying to help. They can write vectorised versions and compare to your
> reference implementation.

I think he means

projects=5 ; # 1000 in his example
startdate=[1 30 50 70 90];enddate=[50 90 180 200 250];value=[1 3 5 7 9];
for i=1:projects
 canvas(i,startdate(i):enddate(i)) = value(i);
end
sum(canvas)