Maple piecewise to MATLAB

Hi,

I am learning Matlab and stumble on this. I have an expression in Maple and trying to write it in Matlab but my basic knowledge plus some search went down the drain. So, I am here seeking some help.

In Maple: result:= (tb,t,tr,i)->piecewise(t<=tb,0 ,tb<t and t<=tb+tr, i*t, t>tb+tr and t<=500, 100, t>500,t-100);

In simple terms:

   tb   >= t then 0

   tb    < t <= tb+tr then i*t

   tb+tr < t <= 500 then 100

   500   < t then t-100

Now, t varies from 1 to 100 with 100 points. [ linspace(1,100,100]

What would be the equivalent of this expression in Matlab?

Many thanks in advance.

Answer 1

[Andrei Bobrov]

variant

function y = resultmatlab(t,tb,tr,ii)
p = t(:);
y = zeros(size(p));
t1 = p<=tb; y(t1) = 0;
t2 = p > tb & p <= tb + tr; y(t2) = ii*p(t2);
t3 = p>tb+tr & p<=500; y(t3) = 500;
t4 = ~(t1|t2|t3); y(t4) = p(t4)-500;
y = reshape(y,size(t));

use (Command window)

>> y = resultmatlab(1:100,20,40,100)

[Bibha]

fantabulous!

It worked perfectly. Thank you again.

Answer 2

[John D'Errico]

The simple answer is to download my piecewise_eval from the file exchange.

http://www.mathworks.com/matlabcentral/fileexchange/9394

John

[Bibha]

Thanks for the link John.