Functions inputs/outputs

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.

[Rik]

You are using terminology from other programming languages. You should try to learn the Matlab terms, as that will help you find the solution on your own.

Your MathematicalFunction has 1 output, and you're asking for 1, so that is fine. Plot3D should accept at least 2 input arguments and 1 output argument.

If you have trouble with Matlab basics you may consider doing the Onramp tutorial (which is provided for free by Mathworks).

[James Tursa]

Please show us the code you wrote for the Plot3D( ) function.

[itai zilcha]

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

Answer 1

[James Tursa]

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'

[itai zilcha]

thanks alot!

Answer 2

[Helene Cheung]

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.