How to make plot from if statement?
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% 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?
采纳的回答
Star Strider
2018-12-15
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.
2 个评论
Agnes Lindsten
2018-12-15
Star Strider
2018-12-15
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.
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