## 220 Reputation

17 years, 71 days
Kharkov
PhD in Numerical Optimization.

## Surely.......

You are right, but for some reasons I would like to force Maple to work properly........

## Simplest way...

Thank you for advise, but, to my mind, the simplest way is the use of abacus istead of computer (it's a joke, don't be offended).

## I see...

Thank you, now I'm aware of this approach.

## OK...

Thank you, Carl. Indeed, Digits = 15 is a threshold for described issue. I would like to know, if it is possible to increase the precision of dsolve's solution in order to calculate integrals with higher precision (Digits > 15)?

## Own way...

Having tryed all ways above, I see, that the simplest method for calculation of integrals of powers of procedures (ua) is to write own procedure of numerical integration based on some integration scheme with control of precision and convergence.

## 2nd way...

Here the result of second workaround:

It is a true curse!

18.02

## This is not work...

Dear Carl, integration of u2 does not work:

## Danke vielmals...

Thank you, Axel. Es funktioniert.

## Thanks...

Thank you. Certainly, It’s a simple straightforward way and if it is not possible to calculate derivative of proc explicitly, it can be used.

## I know...

Of cause, dsolve returns the derivative of solution , I know this:

But I need to calculate the derivative of second order of solution ().

Is it possible?

## I guessed so...

Thank you for reply, I guessed that Matrices/Vectors are handled in special way in Maple sets.

Regards

## Thanks...

Thank you for reply. Your custom procedure uses the cycle through all permutations of rows and  columns and for large m, n, m1, n1 can be computationally intensive. I meant more optimised algorithm suitable for large-sized matrices.
Nevertheless I am very much obliged to you for your fast answer.

## Same issue...

So I have a normal vision, the font in some interface elements of Maple looks annoying. Say I would like to have bigger font in Find dialogue: