anthei

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10 years, 162 days

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These are questions asked by anthei

Dear all,

I do not understand the output of the "Dual" command in the Logic package.

According to the help:

"The Dual command returns the dual of the Boolean expression b, that is, the expression generated by replacing &and with &or, &or with &and, leaving &not fixed, and extending to the remaining Boolean operators by their formulas in terms of &and, &or, and &not."

Applying Dual to "a &implies b" gives:
  `Logic:-&implies`(`&not`(a), `&not`(b))

But "a &implies b" is equivalent to "&not(a) &or b" and its Dual would be "&not(a) &and b", which is not equivalent to the result Maple returns.

Best regards,
 Anthei

Can you please tell me the exact weighting scheme for LinearFit() and NonlinearFit() when using the weights= option?

Is it wi*(yi_exp-yi_calc)^2 or wi^2*(yi_exp-yi_calc)^2 ?

(wi=weight of point i, yi_exp=value i measured, yi_calc= value i calculated from the model function)

Best regards,

 Anthrazius

I am trying to apply window functions from the SignalProcessing package to arrays. However, some window functions (e.g. Hann) appear to operate on a [0..N-1] index basis, others (e.g. Welch) work on [1..N].

I don't know how to make the latter ones work correctly, since after applying the windowing function the first entry in the array is not zero, as it should be.

Best regards

I have a problem with animations using a density plot as background.

The density plot covers the animation.

 

Here is an example:

plt:=densityplot(-(x^2+y^2),x=-1..1,y=-1..1);
animate(plot,[[sin(r)*cos(t),sin(r)*sin(t),t=0..2*Pi],thickness=10],r=0..Pi,background=plt);

 

Can this be solved? 

 

Best regards

  anthei 

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