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I have done engineering maths during university days. However, that was a few years ago. I am reading about fast 2D DCT algorithms and came across a term "tensor product". I think tensors are something that einstien used in his relativity theory Maths somewhere maybe.

Anyway, I know about dot and cross products, but in simple words, what is a tensor product?

quantum231
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  • Do you mean "tensor product"? – Antoni Parellada Aug 31 '17 at 23:55
  • HINT: http://google.com/ Now search for "tensor product". –  Aug 31 '17 at 23:59
  • It’s also sometimes called the “outer product.” – amd Sep 01 '17 at 00:02
  • or wikipeadea it for a rough introduction – Graham Kemp Sep 01 '17 at 00:05
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    @Masacroso that's not a particularly helpful comment. Searching for "tensor product" leads to at least 4 different ideas of what a "tensor" or "tensor product" might be, each which are related, but superficially very different. – Ben Grossmann Sep 01 '17 at 00:05
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    @quantum231 if you want a useful answer, you're going to need to provide a more exact context. Could you link to where you came across the term? – Ben Grossmann Sep 01 '17 at 00:07
  • Ok, I am reading notes on an implementation of discrete cosine transform for 2D DCT. It first appeared in a paper by Ephreim Feig in "IEEE TRANSACTIONS ON SIGNAL PROCESSING, VOL. 40. NO. 9. SEPTEMBER 1992". I am reading its description from book JPEG still image data compression standard by Willam and Joan (1993). The concept of tensor product appears in it. – quantum231 Sep 01 '17 at 21:57
  • Perhaps useful: https://math.stackexchange.com/questions/10282/an-introduction-to-tensors – Hans Lundmark Sep 02 '17 at 10:27
  • thanks, at this stage I have decied to just go with the signal flow graph and not try to learn the complete theory of tensor products. I am however, going to read this link. so thanks. – quantum231 Sep 02 '17 at 14:11

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