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Re: Advanced Math?

by PERLscienceman (Curate)
on Jul 26, 2003 at 13:35 UTC ( #278093=note: print w/replies, xml ) Need Help??


in reply to Advanced Math?

Greetings afkaos: If you want to start with : "Geometric Proportions", geometry/trigonometic related functions can be accessed by using Math::Trig, this is a core module and covers things such as tan, cot, sin, cos, ...etc.; it also has a predefined constant pi. Math::Trig is a core module. You may also want to have a look at Math::Geometry.

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[Lady_Aleena]: Why does grep(/.*$in.*/, @my_modules) work but grep { $_ =~ /.*$in.*/; $_ } @my_modules not work? What did I do wrong in the second?
[tobyink]: Why are you returning $_ n your grep block? You should return a boolean.
[tobyink]: *in your grep block
[tobyink]: You can use grep { $_ =~ /.*$in.*/; } @my_modules but why not stick to grep(/.*$in.*/, @my_modules)? (The latter is faster.)
[shmem]: Lady_Aleena, in the first example grep evaluates the result from grep and if true, returns $_. In the second, it always returns $_
[shmem]: ..the result from the pattern match
[Lady_Aleena]: tobyink, I did after I failed to get the BLOCK to work. I can't seem to get my brain around grep BLOCK, though I'm okay with grep EXPR.
[shmem]: so in the second example grep returns all true elements of the list passed
[Lady_Aleena]: Okay, so grep BLOCK is not like map BLOCK where something might need to be returned at the end.
[tobyink]: grep { $_ =~ /.*$in.*/; } @my_modules should work just fine. The problem is that you were adding on ;$_ at the end of the block. Why were you doing that?

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