# \#doublefloats

**URL:** https://discourse.julialang.org/tag/doublefloats/949.md

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## [Pkg DoubleFloats, some consts flawed](https://discourse.julialang.org/t/pkg-doublefloats-some-consts-flawed/111917)

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**Author:** [@derSchorsch](https://discourse.julialang.org/u/derSchorsch)\
**Replies:** 1\
**Last updated:** [March 21, 2024, 9:19am UTC](https://discourse.julialang.org/t/pkg-doublefloats-some-consts-flawed/111917 "2024-03-21T09:19:45Z")

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Hi all, I have noticed that many of the constants related to pi in the file sequences.jl of pkg DoubleFloats are flawed. For example, the DD values for (15/32)\*%pi read: "Double64(1.4726215563702156, -5.3616983752483455…

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## [Is matrix multiplication multi-threaded for Double64?](https://discourse.julialang.org/t/is-matrix-multiplication-multi-threaded-for-double64/111081)

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**Author:** [@photor](https://discourse.julialang.org/u/photor)\
**Replies:** 4\
**Last updated:** [March 3, 2024, 5:01am UTC](https://discourse.julialang.org/t/is-matrix-multiplication-multi-threaded-for-double64/111081 "2024-03-03T05:01:22Z")

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I tested multiplication of two Double64 matrices and saw no effects on performance by using BLAS.set\_num\_threads(n).

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## [Passing DoubleFloat types into a Julia function](https://discourse.julialang.org/t/passing-doublefloat-types-into-a-julia-function/94425)

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**Author:** [@Thushara\_Gunaratne](https://discourse.julialang.org/u/Thushara_Gunaratne)\
**Replies:** 2\
**Last updated:** [February 10, 2023, 7:22pm UTC](https://discourse.julialang.org/t/passing-doublefloat-types-into-a-julia-function/94425 "2023-02-10T19:22:48Z")

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I’m trying to create a julia function in order to optimize the implementation of a FIR filter that can handle data and coefficients represented with different Floating-Point formats (i.e. Double64, Double32, Double16, Fl…

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## [Code becomes really slow when I combine StaticArrays and DoubleFloats](https://discourse.julialang.org/t/code-becomes-really-slow-when-i-combine-staticarrays-and-doublefloats/87661)

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**Author:** [@jisutich](https://discourse.julialang.org/u/jisutich)\
**Replies:** 18\
**Last updated:** [September 23, 2022, 4:19am UTC](https://discourse.julialang.org/t/code-becomes-really-slow-when-i-combine-staticarrays-and-doublefloats/87661 "2022-09-23T04:19:50Z")

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Hi: I have some code to frequently generate haar random matrices and I want it to run fast. I use the suggestion in https://discourse.julialang.org/t/code-speed-decreases-when-loop-number-increases/78920 that I can use S…

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## [How to change datatype like MATLAB](https://discourse.julialang.org/t/how-to-change-datatype-like-matlab/84946)

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**Author:** [@Starpower\_Power](https://discourse.julialang.org/u/Starpower_Power)\
**Replies:** 5\
**Last updated:** [July 29, 2022, 9:29am UTC](https://discourse.julialang.org/t/how-to-change-datatype-like-matlab/84946 "2022-07-29T09:29:46Z")

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in matlab we can change datatype by double(22/7), is there any method in julia. Thank You

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## [Broken \`eigen\` in DoubleFloats?](https://discourse.julialang.org/t/broken-eigen-in-doublefloats/75946)

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**Author:** [@swishmas](https://discourse.julialang.org/u/swishmas)\
**Replies:** 1\
**Last updated:** [February 7, 2022, 2:41pm UTC](https://discourse.julialang.org/t/broken-eigen-in-doublefloats/75946 "2022-02-07T14:41:19Z")

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I wanted to try some additional precision in julia and I found the DoubleFloats package. I ran the small example but received an error when using the eigen function #using LinearAlgebra #did not change the result using…