Hello I’m a high school junior and was recently self-studying linear algebra. I was reading about calculating determinants and the properties of them. I read that whenever in a determinant, there are 2 similar rows (or columns), then the determinant value must be zero. I have a habit of trying ou…

There’s no efficient way to compute exact integer determinants.

julia> a 4×4 Array{Int64,2}: 1 2 3 7 4 1 7 2 5 7 1 9 1 2 3 7 julia> det(a) 0.0 julia> a = convert(Array{Int32}, a) 4×4 Array{Int32,2}: 1 2 3 7 4 1 7 2 5 7 1 9 1 2 3 7 julia> det(a) 0.0 julia> versioninfo() Julia Version 1.3.1 Commit 2d5741174c (2019-12-30 21:36 UT…

Although (like @Sukera ) I cannot replicate this using a recent Julia version, note that floating point arithmetic has some special properties you should be aware of . If you are following along the calculations in a linear algebra text, you may want to convert to a type that is closed under the oper…

This is weird Im on 1.0.4 the LTS version I tried with numpy still didn’t get zero.

What does julia> versioninfo() say? Do you get the same result if you first restart your computer?

Here it is julia> versioninfo() Julia Version 1.0.4 Commit 38e9fb7f80 (2019-05-16 03:38 UTC) Platform Info: OS: Linux (i686-pc-linux-gnu) CPU: Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz WORD_SIZE: 32 LIBM: libopenlibm LLVM: libLLVM-6.0.0 (ORCJIT, skylake)

I find it a little surprising that Julia converts to floating point here given that the input array was full of Ints.

Possible bug while calculating determinant?

Specific Domains

Tamas_Papp March 14, 2020, 11:24am 8

cf Possible bug in determinant calculation - #8 by stevengj.

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Possible bug while calculating determinant?

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