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

Question

Agustin Foxley 2020-1-28

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评论： Walter Roberson 2023-8-1

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!

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Stephen23 2020-1-28

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.

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Answer 1

Deepak Gupta 2020-5-6

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在 MATLAB Online 中打开

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.

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Answer 2

kazi sharif 2020-9-8

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编辑：Walter Roberson 2022-2-22

在 MATLAB Online 中打开

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.

>>

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Walter Roberson 2021-7-7

You need to store your code in Divide_Average.m

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Answer 3

nina lucia lins dias 2022-3-13

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编辑：Walter Roberson 2023-8-1

在 MATLAB Online 中打开

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()

↑

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

code files.

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Steven Lord 2022-3-13

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 2022-3-13

Many Thanks

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Answer 4

Emmanuel 2023-8-1

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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.