How do you call local functions?
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Caroline F
le 9 Avr 2022
Réponse apportée : Caroline F
le 9 Avr 2022
Hi! I am learning about local functions and I am not sure how to use them with a script. I am trying to make a function with only one input (radius) and two outputs (surface area and volume) for a sphere. I am suppossed to test it with when the radius = pi and have the two outputs. So far I have this and I keep getting an area about matlab being out of memory due to an infinite incursion within the program.
clc
clear all
r(pi)
function radius = r(x)
SA = 4*pi*r^.2;
V = (4/3)*pi*r^.3;
end
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Stephen23
le 9 Avr 2022
Modifié(e) : Stephen23
le 9 Avr 2022
There is no problem with how you are calling the local function.
However there are several basic problems with the function itself:
function radius = r(x) % you do not use variable x anywhere in your function
SA = 4*pi*r^.2; % variable r is undefined, r is a recursive function call
V = (4/3)*pi*r^.3; % variable r is undefined, r is a recursive function call
radius = ??? % You need to define the output variable
end
The main problem is that you think you are using a variable r, but in fact you are calling the function recursively.
Note that both SA and V are completely unused. I strongly recommend that you avoid using one-letter function names.
See the examples here: https://www.mathworks.com/help/matlab/ref/function.html
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KSSV
le 9 Avr 2022
Modifié(e) : KSSV
le 9 Avr 2022
function radius = r(x)
SA = 4*pi*r^.2;
V = (4/3)*pi*r^.3;
end
Save the above function inti a file r.m. (I suggest bigger name). Go the folder where this file is present/ or addpath of the function. Now call the function.
x = 1 ;
radius = r(x) ;
Or, you can copy it in a file and run the code.
clc; clear all ;
radius = r(2) ;
function radius = r(x)
SA = 4*pi*r^.2;
V = (4/3)*pi*r^.3;
end
Give different name to the function. If you name a variable with 'r' your function cannot be called.
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