## 70 Reputation

13 years, 301 days

## ODE second order plot both y and y'...

Maple

I have modeled a simple pendulum with large intital amplitude (so we do not approx sin(theta) by theta).

I have a plot of theta agains time but would like to have both theta (position) and theta' (velcocity) on same graph.

Grateful for any suggestions

Simple pendulum without approximating sin(θ) to θ

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## Using unapply and assign...

Maple

Top part of worksheet gives me a and b; lower part does not

Please tell me where I go wrong. Thanks

Test1.mw

## Problem with subs command...

Maple

I know this is a trivial worksheet (in document mode) but why does the second subs fail? Thanks  Gravity.mw

Justification for using mg as the force exerted by mass m in gravity field g

Using Newton's Law of Gravity, find

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R is >> h, so let R + h = R

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G, M and R are all constants, so let GM/R² = g

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## How to read Help on Eigenvectors...

In the snip from Maple help: please expaln (a) the meaning, (b) how do I enter e1..-1,2 in the last statement?

Thanks

## Complex roots of exp(x)+sin(x)-2...

Maple

Using allvalues (twice) I can uncover the three roots of this expression: 1 real, 2 complex. But fsolve gives me just one real and 1 complex. Interestingly the free version of Woldframalpha.com gives the same single complex root.

Is there any way of coercing fsolve to give both?

Examples of the fsolve command: not all complex roots found

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