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alfarunner

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9 years, 193 days
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These are questions asked by alfarunner

Differentiating in polar coordinates...

alfarunner 85 Maple
derivative vector polar
February 16 2018
3 8

If I have a position vector r(t) i polar coordinates and want to calculate velocity I can't get maple to differentiate the unit vectors w.r.t time. How do I do that?

 

Formatting output...

alfarunner 85 Maple
format fit hfloat
February 13 2018
2 5

How do I format the output from a Fit?

X := [seq(0.1e-1*i, i = 0 .. 12)]; Y := [0, .36, .56, .67, .73, .76, .78, .79, .79, .80, .80, .80, .80]; with(Statistics); f := Fit(a-b*exp(c*x+d), X, Y, x, initialvalues = [a = .8, b = 1, c = -50, d = -.3]); plot({f(x), [seq([X[i], Y[i]], i = 1 .. 13)]}, x = 0 .. .15, color = blue, gridlines = true, style = [line, point], size = [600, 400]);
[0., 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.10,
  0.11, 0.12]
[0, 0.36, 0.56, 0.67, 0.73, 0.76, 0.78, 0.79, 0.79, 0.80, 0.80,
  0.80, 0.80]
  HFloat(0.8011387332253399) - HFloat(1.0911958098409642) exp(
  -HFloat(60.057427500589974) x - HFloat(0.30834993559916535))

 

There are way too many decimals in the output 

plot in radians...

alfarunner 85 Maple
tickmarks axis degrees
January 16 2018
3 1

How do I plot e.g sin(theta), theta in radians but would like to have the x axis labeled in degrees?

S

Defining a cylindrical surface to comput...

alfarunner 85 Maple
cylinder
January 03 2018
1 3

I'm trying to compute the flux over a closed cylinder but can't define the top and bottom.

For the envelope

works fine. But top and bottom?

 

Solve elctrical ODE...

alfarunner 85 Maple
imaginaryunit
November 12 2017
1 1

 

How do I change my input of variable current, I1, to I, without violating the imaginary unit?

S

 

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