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jmlynesjr

by jmlynesjr (Hermit)
on Jul 17, 2012 at 01:30 UTC ( #982107=user: print w/replies, xml ) Need Help??

25+ years real-time software development and support on a variety of Mini-computers, microprocessors and microcontrollers. It all began with Univac 1108 Fortran IV, Data General Nova and Eclipse assembler, punch cards and paper tape with detours through DEC PDP and VAX, Honeywell DDP-516, Lockheed LEC-16, HP 1000, Intel, Motorola, TI, Zilog, and now Microchip assembler, C, and C++ on the Digilent chipKIT UNO Arduino clone.

I hold an Amateur Radio Extra class license - KE4MIQ. I recently began experimenting with Software Defined Radio(SDR) based on a DVB-T USB dongle using gqrx, fldigi, and websdr. I used wxPerl to develop a scanner front end to gqrx and a raw audio display function(sample snapshot shown above).

My degree is in Electrical Engineering from Georgia Tech.

I am now retired and learning linux, chipKIT UNO32, Perl and wxPerl and enjoying the Perl Monks community.

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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

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