Functions inputs/outputs

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itai zilcha
itai zilcha on 8 Mar 2021
Answered: Jean cheung on 16 Mar 2021
Hi i've been coding with matlab for a while now and i ran into a problem with passing inputs to function from main.
For example :
function [cellAr] = MathematicalFunction()
%UNTITLED Summary of this function goes here
% Detailed explanation goes here
x = randi([-10,10] , 1,50);
y = randi([-10,10] , 1,50);
disp(x);
[xx,yy] = meshgrid(x,y);
z = sin(sqrt(xx.^2+yy.^2));
cellAr = {xx , 'x' , yy , 'y' , z , 'z'};
end
i wrote this code to make a meshgrid out of 2 random vectors and calculated a z axis.
For the next step i wanted to make another new function to plot the 3D graph. So i created a new void function that receives 2 inputs both are being sent from the main script and i was unable to send the cellAr and another input from the main script as new inputs to the 3D plot function to use and there were two problems that i couldn't solve :
1) "Too many output arguments". How can i have too many output arguments in a void function?
2)i was unable to send the newly generated cellAr and another string input to my Plot3 function through my main script.
my main looks like this :
clear clc
Array32 = MathematicalFunction();
ThreeDim = Plot3D(Array32,'surfc');
This isn't the first time i have a problem passing elements from main to another function so i must be doing something wrong.
  3 Comments
itai zilcha
itai zilcha on 8 Mar 2021
Edited: itai zilcha on 10 Mar 2021
This is my plot3D function :
function Plot3D(Array32 ,str)
%UNTITLED3 Summary of this function goes here
% Detailed explanation goes here
switch str
case surfc
surfc(Array32(1),Array32(3),Array32(5))
disp('surfc')
case surf
surf(Array32(1),Array32(3),Array32(5))
disp('surf')
case contour
contour(Array32(1),Array32(3),Array32(5))
disp('contour')
otherwise
disp('non')
end
end

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Accepted Answer

James Tursa
James Tursa on 8 Mar 2021
This is the signature of your Plot3D function:
function Plot3D(Array32 ,str)
As you can see, it doesn't return any outputs. But you are requesting an output when you call it like this:
ThreeDim = Plot3D(Array32,'surfc');
Hence the error. So call it without the requested output:
Plot3D(Array32,'surfc');
Also, inside this function you need to supply strings for the comparisons. E.g.,
case 'surfc'

More Answers (1)

Jean cheung
Jean cheung on 16 Mar 2021
And except as James Tursa mentioned, your input Array32(i) of surfc(Array32(1),Array32(3),Array32(5)) are cells.
You should change your type of inputs as follows,
surfc(Array32{1},Array32{3},Array32{5})
Array32(1) is a cell, but Array{1} will be a double array.

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