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blitzpp / blitz

Blitz++ Multi-Dimensional Array Library for C++
https://github.com/blitzpp/blitz/wiki
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Chat or "support" for Blitz++ #103

Closed ClmnsRck closed 5 years ago

ClmnsRck commented 5 years ago

Is there a chat, online forum or anything like it for Blitz++? I have some questions(and will continue to have some) i would ike to as experienced users, but do not fit the issues tab of github.

Right now, i would like if there is a way to access the data array behind the tensor?

slayoo commented 5 years ago

Hello, github issues seem apt to me. The other option is to post to the blitz-support mailing list which is still hosted on SourceForge: https://sf.net/p/blitz/mailman/

Re "is a way to access the data array behind the tensor?": if you mean to access the raw memory region, the Array class has several methods: data(), dataZero() and dataFirst() - see page 22 of the v0.9 manual (http://physik.uni-graz.at/~crg/Programmierkurs1112/pdfs/blitz.pdf).

citibeth commented 5 years ago

Use a loop plus the standard c++ random number generator

http://www.cplusplus.com/reference/random/mt19937/

On Wed, Mar 13, 2019 at 05:01 ClmnsRck notifications@github.com wrote:

Is there a chat, online forum or anything like it for Blitz++? I have some questions(and will continue to have some) i would ike to as experienced users, but do not fit the issues tab of github.

Right now, i would like if there is a way to fill a "pre-shaped" array(meaning shape and arithmetic type are known before-hand) with random numbers?

— You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub https://github.com/blitzpp/blitz/issues/103, or mute the thread https://github.com/notifications/unsubscribe-auth/AB1cd0ZCNSIDRBclBP3FWJ9DmY4JClSxks5vWL52gaJpZM4bstWm .

slayoo commented 5 years ago

Re " if there is a way to fill a "pre-shaped" array(meaning shape and arithmetic type are known before-hand) with random numbers?" you can also use what is built in into Blitz - see chapter 9 "Random Number Generators" on page 73 of the above-mentioned v0.9 manual

ClmnsRck commented 5 years ago

One last question then I will close this issue, to not spam into the issues tab:

C = sum(A(a,b,c) * B(c,d,e),c);

Is this the fastest way right now, to do a Tensor-Dot-Product(Tensor-Inner-product) in Blitz++?