This is off-topic, and I don’t have an answer for you.

I suggest you take a look at the documentation for the functions you are interested in. If you have specific questions, you can post your questions on the newsgroup

Markus, I like your “yesnoinput” and “yesnodialog”. These interface functions (input, questdlg, etc) are already easy to use, but by creating wrapper functions, it makes them even more user-friendly.

Eric, I also have my own “ccc” command which does all of that. I use “close all force” for my closing function

Luca, nice use of MATLAB to give you what you want! MATLAB has its way of returning the results, and you have your way, and they may not always be the same. But with this, everyone’s happy!

function img = magFFT2(kspace)
img = abs(fftshift(fftn(fftshift(kspace))));
end

script ccc
%
clear all
delete(allchild(0)) % stronger than close all
clc

Regards
Markus

function fileSize = getfilesize(fileName)

dirStruct = dir(fileName);
if ~isempty(dirStruct)
fileSize = dirStruct.bytes;
else
fileSize = [];
end

function filename = chomppath(str)
%CHOMPPATH Return file name wihtout path.

str = strrep(str, ‘\’, ‘/’);
[pathname, filename, extension] = fileparts(str); %#ok
filename = [filename extension];

function str = concatpath(varargin)
%CONCATPATH Concatenate file parts with correct file separator.

str = ”;
for n=1:nargin
curStr = varargin{n};
str = fullfile(str, chompsep(curStr));
end
str = strrep(str, ‘\’, ‘/’);

function nowinseconds = mbtime
%MBTIME Return serial date number converted to seconds

% function datenummx is a mex-file found in toolbox/matlab/timefun
nowinseconds = datenummx(clock)*86400;

function deleteallwaitbars
%DELETEALLWAITBARS Delete all existing waitbars.

curShowHiddenHandles = get(0, ‘ShowHiddenHandles’);
set(0, ‘ShowHiddenHandles’, ‘on’);
ch = get(0, ‘Children’);
for k = 1:length(ch)
if strcmp(get(ch(k), ‘Type’), ‘figure’) && …
strcmp(get(ch(k), ‘Tag’), ‘TMWWaitbar’)
delete(ch(k));
end
end
set(0, ‘ShowHiddenHandles’, curShowHiddenHandles);

function deleteallfigures
%DELETEALLFIGURES Delete all existing figues.

close all
close all hidden
drawnow
ch = get(0, ‘Children’);
for n=1:length(ch)
if strcmp(get(ch(n), ‘Type’), ‘figure’)
delete(ch(n));
end
end
drawnow

function spyMatrix = cellspy(cellMatrix)
%CELLSPY Return sparsity pattern for cell arrays.
% Y = CELLSPY(X) returns a matrix of the same size as cell array X with
% zeros at the positions of empty cells and ones for non-empty cells.

spyMatrix = ~cellfun(@isempty, cellMatrix);
if nargout == 0
spy(spyMatrix);
axis normal;
end

function check = yesnoinput(str)
%YESNOINPUT Force user decision.
% YESNOINPUT(STR) diplays string STR and waits for the user to type ‘y’
% for yes or ‘n’ for no. true is returned for yes and false for no.

while 1
answer = input([str,' (yes/no)\n'],’s');
if ~isempty(answer)
if strcmpi(answer, ‘y’) || strcmpi(answer, ‘yes’)
check = true;
return
elseif strcmpi(answer, ‘n’) || strcmpi(answer, ‘no’)
check = false;
return
end
else
disp(‘Incorrect input. Try again’);
end
end

function check = yesnodialog(question, windowtitle, defaultAnswer)
%YESNODIALOG Open window for user decision.

if ~exist(‘windowtitle’, ‘var’) || isempty(windowtitle)
windowtitle = ‘Question dialog’;
end
if ~exist(‘defaultAnswer’, ‘var’)
defaultAnswer = ‘yes’;
end

while 1
answer = questdlg(question,windowtitle,’yes’,'no’,defaultAnswer);
switch answer
case ‘yes’
check = true;
return
case ‘no’
check = false;
return
end
end

script profileon:

profile off
profile clear
profile on -detail builtin

script profilereport:

profile report
profile off

There are couple of situations I can think of for lazy copying. One is when you are creating copies of variables:

a = rand(1000);
b = a;
c = a;


Although there are three 1000-by-1000 matrices, there’s only one of them in memory. The other two are simply referencing the one. As soon as you modify the variables, then actual physical copies are made.

Another one is when you are passing a variable into a function. Even though a function has its own workspace, if the input variable being passed is only being referenced (not modified), it is not being copied (see the first example in Loren’s post).

That was a nice,simple, and informative post.

When does lazy copying become a factor in practice?

As far as nicknames, how does “Dig Doug” sound? Or maybe “Doug the Destroyer”? Or my personal favorite, “Doug Diesal”