## 1450 Reputation

19 years, 59 days

## Not then, not now....

Maple

There is a builtin command "callback". It exists both in Maple 5 and today's Maple. There is no documentation on it. What is it? Why does it exist? Is there any code that uses it?

Maple , MaplePrimes

Does Maple have a way to upload a screenshot of a worksheet or a savefile of a worksheet to MaplePrimes?

## Maple types. ...

Maple

What Maple type should I use so that test1 and test2 are always equal? (I use Maple 2017)

 test1 := proc(x) type([op('x')], identical(['x'])) end; MapleType := anything; test2 := proc(x) type(x, MapleType) end;

## Real roots of a polynomial....

Maple

What is a good way to generate a random, high degree polynomial with integer coefficients, that has a high number of real roots. Example a degree 800 with 600 real roots. I am not looking for a mul application.

## NULL response. Correction needed....

Maple 2017

Why does this code return NULL? Which, earlier than 2017 version of Maple differs? What other Maple function could be used in place of eliminate for the general case?

 eliminate({x[5] = x[2] / x[1], x[6] = x[3] / x[2], x[7] = x[1] / x[4], x[8] = (2 * x[2] + x[4]) / (2 * x[1] + x[3] + x[4])}, {x[1], x[2], x[3], x[4], x[8]});

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