Help with Code Problem

for k=1:0.1:5;
eval(['HT_' num2str(k) '=H;']);
end

This code works for odd numbers(ie 1,2,3,etc) but it wont work with decimal numbers(i.e 1.1,1.2, etc). Its giving an error every time I try. Can anyone please come to rescue? Thanks in advance.

[Stephen23]

The awful eval strikes again.

By choosing to use eval you write buggy code. This is classic example of bad code causing pointless problems that could be avoided by simply avoiding eval. The problem is that you are trying to generate an invalid variable name. However because you used the awful eval MATLAB cannot tell you exactly where this error occurs, because by using eval you have removed all of the very useful code checking and code helper tools that MATLAB has built in. This is like driving blindfolded. You are a beginner, why do you pick the one function that makes programming more difficult?

Learn to program properly without eval and you will never have these kind of difficult to debug problems which give obscure error messages. Because when you program properly (without eval|), MATLAB actually helps you and gives code hints and checks your code as you write it.

Don't create numbered variables. Use a cell array. Or a numeric array. Or structure. And then learn about indexing.

[Bilal Bingolbali]

Yeah I am new to Matlab and as of now I aint got any other option apart from eval code...what do u suggest I do?.Thanx angain.

[Stephen23]

".what do u suggest I do?"

Do these tutorials:

http://www.mathworks.com/help/matlab/getting-started-with-matlab.html

And read these:

https://www.mathworks.com/help/matlab/matlab_prog/string-evaluation.html

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

http://www.mathworks.com/matlabcentral/answers/228557-experts-of-matlab-how-did-you-learn-any-advice-for-beginner-intermediate-users

[Walter Roberson]

If it worked, what would you like the result to be for k = 1.2 (for example) ?

Answer 1

[Star Strider]

All that said, if you want decimals from num2str, you have to specify a format descriptor:

num2str(k, '%3.1f')

That will work, although I have no idea if it will work in the code you posted.

There is a legitimate reasons to use eval, the most significant being that you have a series of dynamically-created variables that you did not yourself create and that you are saving to a matrix in order to correct the original error in creating them, but beyond that dynamically-created variables are to be avoided.