what does the error mean for "Function definitions are not permitted in this context."?

clc; close all; clear all; levels = 5; im=imread('C:\Users\netuser\Desktop\project ssf\ssf.jpg'); function [gaussout] = gauss_pyramid(im, levels) gaussout = cell(1,levels+1); gaussout{1} = im; subsample = im; figure(1); imshow(im); for i = 2 : levels+1 subsample = reduce(subsample); gaussout{i} = subsample; figure{i}; imshow(gaussout{i}); end end

[Jan]

Please read and apply http://www.mathworks.com/matlabcentral/answers/13205-tutorial-how-to-format-your-question-with-markup .

Answer 1

[Jan]

You can save code in two kind of files: scripts and functions. Functions start with the keyword "function" and if this is missing, the file is a "script".

Functions have the advantage, that they have their own workspace (set of locally used variables), while scripts share the workspace with the caller. This makes the sharing of variables easier, but more dangerous, because a script might modify a variable used in the caller, but this is not visible during reading the source code.

Since Matlab R2016b you can define functions inside script files, but for older versions, functions could be defined in function files only. You cannot define a function in the command window.

The code can be simplified:

function gaussout = gauss_pyramid(im, levels) 
gaussout = cell(1, levels+1);
for k = 1 : levels+1 
  gaussout{k} = im; 
  figure(k); 
  imshow(im);
  im = reduce(im); 
end 
end