## 90 Reputation

10 years, 142 days

## Differentiating in polar coordinates...

Maple

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...

Maple

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

Maple

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...

Maple

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...

Maple

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

S

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