7 years, 61 days

## laplace of Dirac derivative...

Maple

restart;
with(inttrans);
[addtable, fourier, fouriercos, fouriersin, hankel, hilbert,

invfourier, invhilbert, invlaplace, invmellin, laplace, mellin,

savetable]
laplace((diff(Dirac(t), t))*cos(t), t, s);
0
int((diff(Dirac(t), t))*exp(-s*t)*cos(t), t = 0 .. infinity);
1
- s
2

## different answers to same command...

Maple 2016

Why do I get different answers for the same command?

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 (1)
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 (2)
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 (3)
 >

Maple

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 (1)
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 (2)
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 (3)
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 (4)

## Plot DE solution with unapply...

Maple

I want to use the solutuion of a DE as a function, including the possibility to plot it.

I have found out that the following comands work, but I cannot undesrtand why. Is there a simpler way?

Truly, Roberto R. Baldino

sol := dsolve({eq, icon}, i(t));
i := unapply(eval(i(t), sol), t);
plot(i(t), t = 0 .. 20, view = [-1 .. 20, -3 .. 3], gridlines);

## hatching number in 3d plots...

How to change the numer of hatchings in a 3d plot?

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