How to write a function to display two messages to the user (in Matbal 2011)?

Hello everyone. I've been reading a tutorial about Matlab 6.1 but I'm working with Matlab 2011.

(I'm sorry if I make a mistake talking about string/integer but I'm new to Matlab and I use to program in C/Java/...)

I have to write a simple function doing the following:

- it takes two string (name1 and name2)

- it returns two integer representing how many characters the two string have (size1 , size2)

- the function print two lines:

• "Hello name1" (where name1 is what I pass to the function)
• "Hello name2" ((where name2 is what I pass to the function)

The code (it works in Matlab 6.1) provided by the tutorial is:

function [size1,size2] = helloNames (name1,name2)
% print Hello + name 1 , Hello + name 2
[rowNumber,size1] = size(name1);
[rowNumber,size2] = size(name2);
disp(cat(2,'Hello ',name1));
disp(cat(2,'Hello ',name2));

But in Matbal 2011 it doesn't works and I've tried to modify it but I can't get the same result.

Any suggestion? And what's used for "cat"?

Thank you in advance

Answer 1

[Sean de Wolski]

doc cat

for more info on cats. That looks like it should work, what error are you recieving?

More per comments

A = rand(10,15);

%example1
[junk, sizeEX1] = size(A);

%example2
[~, sizeEX2] = size(A);

%example3
[sizeEX3] = size(A);

Compare the various variables.

Answer 2

[Srinivas]

helloNames('name1', 'name2')

should work

Answer 3

[Manuel]

@Srinivas.. well its' strange It works now (but I'm sure it didn't worked). Just a question: function [size1,size2] = helloNames (name1,name2) % print Hello + name 1 , Hello + name 2 [rowNumber,size1] = size(name1); [rowNumber,size2] = size(name2); disp(cat(2,'Hello ',name1)); disp(cat(2,'Hello ',name2));

give the warning "rowNumber appears to not be used"(and I understand this)..If I click fix rowNumber is replaced witch "~". What does "~" means? And what's difference there is between:

[~,size1] = size(name1);
[~,size2] = size(name2);

and

[size1] = size(name1);
[size2] = size(name2);

?

[Sean de Wolski]

[~,size1] = doesn't use memory filling that output with stuff you plan to use but makes size1 the second output argument

[size1] = makes size1 the first output argument.

[Manuel]

Thank you for your answer. But I can't understand the explanation.

Could you make an example please?

[Sean de Wolski]

see edit in my answer