piecewise function and function handles

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Gianluca Angelini
Gianluca Angelini 2023-11-21
编辑： Dyuman Joshi 2023-11-21
Hi everybody, I have a little trouble issues with my function handles.
In particular I am trying to describe a function handle which has a specific value (related to two variables) in a range of one of the two vairables, and 0 otherwise.
E_2rad=0.79;
@(freq_wave,wave_angle) (0<= wave_angle <= pi-E_2rad) .* ((2.25/4)*ro_w*g*B*0.75).*(sin(E_2rad+wave_angle).^2+(2.*freq_wave.*(vel_nave/g).*(cos(E_2rad).*cos(E_2rad+wave_angle)...
-cos(wave_angle)))) + (wave_angle > pi-E_2rad) .* 0
the function written as above mentioned returns a value different from 0 if wave_angle > pi-E_2rad instead and I cannot understand why and how to fix it. Thanks in advance for your help

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Dyuman Joshi
Dyuman Joshi 2023-11-21
You need to define multiple conditions separately/individually i.e -
This
(0<= wave_angle <= pi-E_2rad)
should be -
(wave_angle >=0) && (wave_angle <= pi-E_2rad)
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Gianluca Angelini
Gianluca Angelini 2023-11-21
Don't worry. You couldn't have known about integrals.
By the way all the problems aforementioned are fixed. Thanks again!
Dyuman Joshi
Dyuman Joshi 2023-11-21
编辑：Dyuman Joshi 2023-11-21
The anonymous function is vectorized and so, for the given comparison, I should have noted that it should be a single ampersand. (I really should be going to sleep earlier :P)
Nonetheless, glad to know that your issue is solved. Happy to have helped!

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