[SOLVED] Matlab plotting help:peicewise with loops

so i've tried to plot this funtion multiple times using every trick i can come up with and the loop still only goes through the first ifelse statement in the function file. here is a copy of my function file:

Code:

`function y=f(x)`

if x<=-1;

y=15;

elseif -1<=x<=1;

y=-5.*x+10;

elseif 1<=x<=3;

y=-10.*x.^2+35.*x-20;

elseif 3<=x<=4;

y=-5.*x+10;

elseif 4<=x<=5 ;

y=-10;

end

end

using this file I try to plot in my main file which is:

Code:

`delete g228x07.txt; diary g228x07.txt`

clear; clc; close all; echo on

% Gilat 228/7

x=[-2:.01:5];

n=length(x);

for i=1:n;

y(i)=f(x(i));

end

plot(x,y);

grid on

echo off; diary off

the first three lines are just a reference header and do not impact the problem. I don't know if the loop fails in the for loop or in the ifelse on the function file.