Adding Dot For Linspace

Hello friends,I have parametric equation about 5 paper,I want to add dot for every * and / signs to use linspace.How can I do automatically

[Rik]

Have a read here and here. It will greatly improve your chances of getting an answer.

Answer 1

[Star Strider]

Use the vectorize (link) function.

The only change you temporatily need to make is to create your function as a character vector by putting single quotes (') around it first, then removing them from the vectorize output.

Example —

f = exp(-0.1*t) * sin(2*pi*t);
fv = vectorize('exp(-0.1*t) * sin(2*pi*t)')

producing:

fv =
    'exp(-0.1.*t) .* sin(2.*pi.*t)'

You then have to manually edit your expression to put it back as a valid expression. That simply means removing the single quotes:

f = exp(-0.1.*t) .* sin(2.*pi.*t)

and your expression is vectorized, ready for your linspace arguments!

EDIT — Corrected typographical errors.

[Rik]

Nice function. It turns out you still keep learning about functions that have been around for ages.

[Star Strider]

@Rik — Thank you!

That’s certainly my experience, too. I learn about a lot of functions — at least some of which I believe I should already know — when others mention them here on Answers. Even going through the Release Notes does not always uncover all of them, since there are so many.

[Ertan Aras]

Thanks a lot.I ve solved this problem utilizing vectorize functions.

[Star Strider]

As always, my pleasure!

Answer 2

[gonzalo Mier]

You have two possibilities here:

1. In the text file, you replace * by .* and / by ./ in all the document (there is an option in the replace to replace all).
2. If you have it like a function and want to do it by programming, you can overload the funtion mtimes and mrdivide by times and rdivide as:

function c = mtimes(a,b), c = times(a,b); end
function c = mrdivide(a,b), c = rdivide(a,b); end

You can add this to the end of your file or to your folder.

By preference, always do the first method, as overloading operators is not a good practice unless you try to ofuscate your code, but I have found some moments where it's the only way