How to make plot from if statement?

% Hi I am really stuck and would very much appreciate help!
% I want to make a graph that looks like this:

% Here is my code:

x = linspace(-5,5,50);

    if (x>-2 & x<0)
        Y = x*1.5+3

    elseif (x>0 & x<2)
        Y = x*(-1.5) + 3
        
    else
        Y = 0  
        
    end
plot(x,Y)

% How can I plot this?

Answer 1

[Star Strider]

This version uses ‘logical indexing’ in the function:

x = linspace(-5,5,50);

Yfcn = @(x) (x*1.5+3).*(x>-2 & x<0) + (x*(-1.5) + 3).*(x>0 & x<2);

figure
plot(x, Yfcn(x))
grid

It is essentially your code, otherwise.

[Agnes Lindsten]

Ah, thank you so much!

Tried to do something similar before, but failed with the dots. xP

[Star Strider]

As always, my pleasure!

The expressions and the logical values are both vectors, so it is necessary to use element-wise operations (here, multiplication) with them. See the documentation section on Array vs Matrix Operations (link) for an extended discussion.