How to plot a piece-wise function using FPLOT

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Ali Remo
Ali Remo 2017-1-29
评论： Star Strider 2017-1-29
Hello Please state if possible, how to use fplot to have the graph of a piecewise function. Actually the code below is exactly according to the matlab page: https://uk.mathworks.com/help/matlab/ref/fplot.html
fplot(@(x) exp(x),[-3 0],'b')
hold on
fplot(@(x) cos(x),[0 3],'b')
hold off
grid on
But, it does not work for me. The code plots only the second function, cos(x). Please help me if possible.

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Star Strider
Star Strider 2017-1-29
编辑：Star Strider 2017-1-29
It is easiest to use ‘logical indexing’ in your function.
This works:
f = @(x) exp(x).*(x<=0) + cos(x).*(x>0);
figure(1)
fplot(f, [-3, 3])
grid
EDIT — The code you posted actually works for me without error, producing the correct plot. The online documentation is for the current release (that I believe is still R2016b), so if you have an earlier version, that could be a problem. My code should work.
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Ali Remo
Ali Remo 2017-1-29
@Star Strider , Thank you very much for your help. Yes actually the main code contains functions which are continuous in continuous intervals. The code above which I wrote was only to say what my problem is actually. In each interval I have a different function, but finally they generate a continuous function, for example:
in the interval [0 1] ....... f1(x) = x
in the interval [1 2] ....... f2(x) = x^2
.
.
.
and as you can see, these two samples are continuous at the point x=1. The point is that I have to produce these function in a FOR LOOP and plot them in a single graph. Thank you
Star Strider
Star Strider 2017-1-29
My pleasure.
If my Answer helped you solve your problem, please Accept it.

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