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A Clone of Maxima's repo
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question on diff after load(itensor) #441

Open rtoy opened 3 months ago

rtoy commented 3 months ago

Imported from SourceForge on 2024-07-02 19:51:30 Created by danielvolinski on 2014-08-04 13:15:02 Original: https://sourceforge.net/p/maxima/bugs/2794

Hi Maxima gurus:

After loadind itensor

I understand diff(x([],[2]),x([],[1])); -> kdelta([1],[2]) ev(%,kdelta); -> 0

I understand diff(cos(x([],[2])),x([],[2])); -> -kdelta([2],[2])*sin(x([],[2])) ev(%,kdelta); -> -sin(x([],[2]))

But I don't understand diff(cos(x([],[2])),x([],[1])); -> 'diff(cos(x([],[2])),x([],[1]));

Why isn't de derivate carried out? How can I make it do the derivative? Isn't the result: -kdelta([2],[1])*sin(x([],[2]))

I'm using "5.31.2" on Windows

Thanks,

Daniel

rtoy commented 3 months ago

Imported from SourceForge on 2024-07-02 19:51:31 Created by danielvolinski on 2014-10-11 08:31:58 Original: https://sourceforge.net/p/maxima/bugs/2794/#3163

Is anybody answering this question?

Daniel