Error: Function definition not supported in this context. Create functions in code file.

Hello,

I was trying to create a simple function on matlab, I already have a file named "AddOne.m", so it should work, however at the first line of code, matlab throws the following error

"Error: Function definition not supported in this context. Create functions in code file.". Any ideas how to sort this out?

Thanks in advance!

[Stephen23]

In MATLAB functions cannot be defined in the command window.

You appear to be running the entire function in the command window in an attempt to define that function.

You don't need to do that: just define the function in a file, and then call it. That is all you need to do.

Answer 1

[Deepak Gupta]

Hi Augstin,

In matalb, you need to write your function in a seperate matlab file and then you can call this function either from command window or from a seperate matlab file.

For example, here you can write your matlab function addOne.m in one file. File content can be something like:

%File addOne.m
function finalAnswer = addOne(inputNumber)
    finalAnswer = inputNumber+1;
end

Now you can use this function in your other matlab file or in command window. For example, you can create a seperate file to call this function.

% File testaddOne.m
inputNumber = 5;
finalAnswer = addOne(inputNumber);
disp('Thining...');
fprintf('Final Answer: %d \n', finalAnswer);
display('Done');

To avoid confusion, for now keep both files at one place. When you run file testaddOne.m, it will automatically call other file and make use of it.

Cheers.

Answer 2

[kazi sharif]

function Divide_Average(a,x0,tol)
clc


if a<0
    b=abs(a);
else
    b=a;
    %fprint(' Neagtive Number is not taken in Square root');
    
end

x = zeros(1,1);
fprontf('i x(i)\n');
fprintf('---------\n');
x(1)= x0; fprintf('%5.0f\t %15.5f\n',1,x(1));

i=2;

while (1)
    x(i) = 0.5*(x(i-1) + a/x(i-1));
    fprintf('%5.0f\t %15.5f\n',i,x(i));
    RelER = (x(i) - x(i-1))/x(i-1);
    if abs(RelER) <= tol, break, end
    i = i + 1;
end
fprintf('\n\n Square Root of %10.5f\t is %10.5f\n',a,x(end));
end

function Divide_Average(a,x0,tol)

↑

Error: Function definition not supported in this context. Create functions in code file.

>>

[Walter Roberson]

You need to store your code in Divide_Average.m

Answer 3

[nina lucia lins dias]

I am trying to do this:

function edge_r ( )
im = imread('rice.png');
[row col] = size(im)
for i=1:row-1
    im2(i,j) =abs(im(i+1,j+1)) + abs(im(i+1,j));
end
end
figure, imshow(im2);
figure, imshow(im)

however i cannot writing down the whole statement cos it gave me errors

function edge_r()

function edge_r()

↑

Error: Function definition are not supported in this context. Functions can only be created as local or nested functions in

code files.

[Steven Lord]

You cannot type the function keyword in the Command Window. Save that function in a file named edge_r.m and then call the function in the Command Window.

[nina lucia lins dias]

Many Thanks

Answer 4

[Emmanuel]

function predator_simulation() ↑ Error: Function definition are not supported in this context. Functions can only be created as local or nested functions in code files.

[Walter Roberson]

Functions cannot be defined at the command line. You must store that code in predator_simulation.m file.

Answer 5

[Fathima]

function bitDepth = fetchBitDepth(imageData)

↑

Error: Function definitions are not supported in this context. Functions can only be created as local or nested functions in code files.

[Stephen23]

Functions cannot be defined at the command line. You must store that code in fetchBitDepth.m file.

Tip for the future: read the thread before posting.

Answer 6

[lee]

Sorry I'm sure this has been asked here, I am terriblew with matlab. I used to run this code, but now I get the error message: Function definitions are not supported in this context. Functions can only be created as local or nested functions in code

files.

Can someone please help me on how to fix it, code and instruction from original author attached

[Stephen23]

"Can someone please help me on how to fix it"

Here is the first line of that Mfile:

calculatorISR('testrange',[1,2,3,4,5,6])function calculatorISR(varargin)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ !!!!! DELETE THIS !!!!!

You need to delete everything before the FUNCTION keyword. When you add code before (or after) the function definition then you turn the Mfile into a script and it cannot be called as a function any more.

The first line of the Mfile should be this:

function calculatorISR(varargin)

and nothing else.

[lee]

You are an absolute life saver, thank you so much. I'm not a natural programmer haha, and even then tend to use python rather than matlab.

Thank you so much!