How to call an old build-in function in a new version of Mathematica?

Asked Nov 08 '19 at 01:12

Active May 16 '20 at 16:27

Viewed 198 times

In order to use the UnitStep of Mathematica 5.2, I have to install two different versions 5.2 and 11.3 at the same time because Unitstep is different in the two versions (UnitStep has different derivatives in the two different verions of Mathematica, I listed the difference here). Today I suddenly think of that: Can I call the old version UnitStep of MMA 5.2 in the new Mathematica 11.3? How to realize if it's true? Thank you.

edited May 16 '20 at 16:27

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asked Nov 08 '19 at 01:12

likehust

@ Nasser, the MathKernel.exe will not run, but the math.exe can run in the CMD window correctly. – likehust Nov 08 '19 at 02:22
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You can use version 5.2 Kernel from newer kernel via MathLink: "Executing code in v.5.2 kernel from within v.7.01 session through MathLink." – Alexey Popkov Nov 08 '19 at 06:52
@AlexeyPopkov, thank you, it's a good solution, but too complex and easily generates error. I continue to combine 5.2 and 11.3 because I can debug codes with ease. – likehust Nov 08 '19 at 07:49
I'm curious, what you mean by "I continue to combine 5.2 and 11.3"? How do you do that? – Alexey Popkov Nov 08 '19 at 08:05
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@AlexeyPopkov, To use 5.2 when deriving symbolic formulas because it always gives anticipating results using UnitStep, then use 11.3 when calculating and plotting because the graphics are better in 11.3 than in 5.2 – likehust Nov 08 '19 at 08:08

How to call an old build-in function in a new version of Mathematica?

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