problem with entering variables in a function

function [ output_args ] = Newfunction( h )
%UNTITLED Summary of this function goes here
%   Detailed explanation goes here
if 105<h<120 
   warningMessage = sprintf('Warning: your velocity = %f\nYou may stall!', h);
uiwait(warndlg('Approaching Stall'));
elseif 100<h<105;
  warningMessage = sprintf('Warning: your velocity = %f\nYou may stall!', h);
uiwait(warndlg('Close to stall'));
    elseif h<100
         warningMessage = sprintf('Warning: your velocity = %f\nYou may stall!', h);
uiwait(warndlg('STALL'));
        end
end

**This is my function but i keep getting this error ??? Input argument "h" is undefined.

Error in ==> Newfunction at 5 if 105<h<120

Answer 1

[Azzi Abdelmalek]

Use

if 105<h & h<120

and

elseif 100<h & h<105

[Achchuthan Ganeshanathan]

h=100
Newfunction=(h);
function [ output_args ] = Newfunction( h )
%UNTITLED Summary of this function goes here
%   Detailed explanation goes here
if 105 < h && h < 120 
   warningMessage = sprintf('Warning: your velocity = %f\nYou may stall!', h);
uiwait(warndlg('Approaching Stall'));
elseif 100<h && h <105;
  warningMessage = sprintf('Warning: your velocity = %f\nYou may stall!', h);
uiwait(warndlg('Close to stall'));
    elseif h <100
         warningMessage = sprintf('Warning: your velocity = %f\nYou may stall!', h);
uiwait(warndlg('STALL'));
end

*This is what I have done and i keep getting error messages ??? Input argument "h" is undefined.

Error in ==> Newfunction at 5 if 105 < h && h < 120

??? Error: File: Newfunction.m Line: 3 Column: 1 Function definitions are not permitted in this context. *

[Azzi Abdelmalek]

Remove this

Newfunction=(h);

[Achchuthan Ganeshanathan]

I have removed it like you said. but it refers to my 'function' as error ??? Error: File: Newfunction.m Line: 2 Column: 1 Function definitions are not permitted in this context.

[Azzi Abdelmalek]

Can you explain, from where are you calling this function? because your function begins by

function [ output_args ] = Newfunction( h )

Only when you want to call it from any object, you type

h=100
output_args = Newfunction( h )

[Achchuthan Ganeshanathan]

Oh i get what you mean. I am not calling the function yet. because I am developing my GUI at the same time. So for now could i just set the

h=100

output_args = Newfunction(h)

[Achchuthan Ganeshanathan]

h=108;
[ output_args ] = Newfunction( h );
%UNTITLED Summary of this function goes here
%   Detailed explanation goes here
if 105 < h && h < 120 
   warningMessage = sprintf('Warning: your velocity = %f\nYou may stall!', h);
uiwait(warndlg('Approaching Stall'));
elseif 100<h && h <105;
  warningMessage = sprintf('Warning: your velocity = %f\nYou may stall!', h);
uiwait(warndlg('Close to stall'));
    elseif h <100
         warningMessage = sprintf('Warning: your velocity = %f\nYou may stall!', h);
uiwait(warndlg('STALL'));
end

that is my new function, it doesn't seem to have any errors but when I do run it it comes up with

??? Attempt to execute SCRIPT Newfunction as a function: /Users/Achchu/Documents/MATLAB/Newfunction.m

Error in ==> Newfunction at 2 [ output_args ] = Newfunction( h );

[Azzi Abdelmalek]

I am not sure that you know how function works. To test if your function is working save the above code as Newfunction

function  output_args = Newfunction( h )
%UNTITLED Summary of this function goes here
%   Detailed explanation goes here
if 105 < h && h < 120 
 warningMessage = sprintf('Warning: your velocity = %f\nYou may stall!', h);
uiwait(warndlg('Approaching Stall'));
elseif 100<h && h <105;
warningMessage = sprintf('Warning: your velocity = %f\nYou may stall!', h);
uiwait(warndlg('Close to stall'));
  elseif h <100
       warningMessage = sprintf('Warning: your velocity = %f\nYou may stall!', h);
uiwait(warndlg('STALL'));
end

Then from window command call your function:

h=100
output_args = Newfunction( h )

Note: You have not assigned any value to output_args, if it's intented then write

function  Newfunction( h )

[Achchuthan Ganeshanathan]

I have done what you said and when i type in h= 100 and output_args..... I am getting this error again

??? Input argument "h" is undefined.

Error in ==> Newfunction at 5 if 105 < h && h < 120

>> h=100

h =

   100

>> output_args = Newfunction (h) Error in ==> Newfunction at 5 if 105 < h && h < 120

??? Output argument "output_args" (and maybe others) not assigned during call to "/Users/Achchu/Documents/MATLAB/Newfunction.m>Newfunction". >>

[Achchuthan Ganeshanathan]

Thankyou for helping me btw.. this is a part of my final year project at university and I have a deadline in 2 weeks to get it all up and running.. thankyou so much

[Achchuthan Ganeshanathan]

It is working now thankyou :)

Answer 2

[Ruben]

where and how do you call your function? for example if h = 100, you should call it like this:

Newfunction( 100 )

or

h=100;
Newfunction(h)

[Achchuthan Ganeshanathan]

i am writing this function in order for it to be called into a GUI. My 'h' should be something that changes as its a user input in the GUI. Is there any way i could make h a changing variable in the function. Or do I have to define 'h' for now and relate it back to the GUI when i callback the function

[Azzi Abdelmalek]

every time you call your function, wherever it is, you have to assign a value to h.

[Achchuthan Ganeshanathan]

do i have to assign this value in my GUI function. because I have assigned a value for h and wrote the function but still keep getting error messages

[Ruben]

as I see it now, you have assigned a value for h, but you're not supplying it to the function you wrote. There are two ways to overcome this.

1) supply the h as an input to your function every time you call it by calling your function like this: Newfunction(h) instead of: Newfunction

2) convert your function to a script. scripts don't require input, but are able to use all the current variables.

I'm no GUI-guru, so I don't know what is the best approach for your problem