MATLAB: Echo off or semicolon in GUI

MATLABmatlab gui

This might be very basic (stupid) question but I will ask anyway. Does eat make sense to use echo off in a matlab GUI, and does it make the program run faster? Which is the preferred, echo off or semicolon after each function. And finally, how do I place/use the echo off in a GUI code. Thanks from a novice.

Best Answer

It makes sense to use echo off pretty much every time. Although echo on is used for debugging purposes, there are better way to debug code via error messages and the debugger.
echo off is faster, no time spent printing message.
always use semicolon to suppress function outputs. It should be a habit to use ";" as many programming languages uses the semicolon to end a statement.
if you use semicolon, you don't have to place echo off in your GUI, unless you want it to turn echo on / off as part of a debugger option for your GUI.

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MATLAB: Adding continuously to get a sum of how many words there are

NEW ANSWER: treats a word as one that starts with a letter

function wordcount = getWords
str = 'jeff john 2lion lion2 this2that dog.';
strcell = regexpi(str, '\w*', 'match');
%Defining word as one that starts with a letter (this2that would still be a word)
wordloc = cellfun(@(x) ~isempty(regexpi(x(1), '[a-z]')), strcell);
wordcount = sum(wordloc); %number of words
nonwordcount = sum(~wordloc); %number of non-words

%Displaying words /  nonwords
fprintf('Is a word: %s\n', strcell{wordloc})
fprintf('Not a word: %s\n', strcell{~wordloc})

Outputs:

Is a word: jeff
Is a word: john
Is a word: lion2
Is a word: this2that
Is a word: dog
Not a word: 2lion

OLD ANSWER: One way to do this without loops:

function getWords
str = 'jeff john 2td tomorrow 3e4 a23 dog.';
strcell = regexp(str, '\s+', 'split');
wordloc = cellfun(@(x) isempty(regexp(x, '[^a-zA-Z\.]', 'once')), strcell); %gets location of string with only letter a-zA-Z
wordcount = sum(wordloc); %number of words, 4
nonwordcount = sum(~wordloc); %number of non-words

MATLAB: How to make a simple start button

Check out the following link http://www.mathworks.com/help/matlab/ref/questdlg.html. You can use a question dialog to query the user if he/she wishes to start the program or not. Based on that result, the program will continue (or not).

Best Answer

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MATLAB: Adding continuously to get a sum of how many words there are

MATLAB: How to make a simple start button

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