Anonymous function in MATLAB

Question

I want to write the following anonymous function in MATLAB.

I have a piecewise function. I want to turn this into a single expression. How can this be accomplished in MATLAB ?

$$f(x,t) = \begin{cases} 20e^{-4x^2} & \text{if $0 \leq t \leq T/2,$} \\ 0 & \text{otherwise.} \end{cases}$$

cfdlab · Accepted Answer · 2020-11-13 03:19:27Z

4

T = 1.0;
f = @(x,t) (0 <= t & t <= T/2)*20*exp(-4*x.^2) + 0.0;
x = linspace(0,1,100);
plot(x, f(x,T/4), x, f(x,T))
legend('t=T/4','t=T')

answered Nov 10, 2020 at 6:29

cfdlab

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$\begingroup$ How can you initialise T to be 1 ? T can be anything. $\endgroup$
– user36184
Nov 10, 2020 at 6:35
$\begingroup$ Set T to whatever you want. I just gave an example. $\endgroup$
– cfdlab
Nov 10, 2020 at 6:47
6

$\begingroup$ To enable vectorization with respect to t, you'll need f = @(x,t) (0 <= t & t <= T/2)*20*exp(-4*x.^2) + 0.0;, that is, logical and without short-circuiting (& instead of &&). $\endgroup$
– cos_theta
Nov 10, 2020 at 13:24
$\begingroup$ @cos_theta Thanks I didnt know this, I updated the answer. $\endgroup$
– cfdlab
Nov 13, 2020 at 3:19

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