## 5662 Reputation

18 years, 194 days
Munich, Bavaria, Germany

## dsolve/numeric and numerical functions...

Maple
`Int(exp(t), t= 0 ..x) +1 is just a way to write exp(x), use value(%).ff:= x -> evalf(Int(exp(t), t= 0 .. x, method = _d01ajc) + 1) doesthe same, but in a numerical way.Now consider that as a differential equation, to be solved numerically:de:=D(f)(x) = f(x);dsolve({%, f(0)=1});                         f(x) = exp(x)ff:= x -> evalf(Int(exp(t), t= 0 .. x, method = _d01ajc) + 1);D(f)(x) = ff(x);sol:=dsolve({%, f(0)=1}, numeric);  Warning, The use of global variables in numerical ODE problems is deprecated,  and will be removed in a future release. Use the 'parameters' argument instead  (see ?dsolve,numeric,parameters)sol(1);  Error, (in sol) parameter 't' must be assigned a numeric value before  obtaining a solutionQuestion: how to write it down correctly?`

## some ugly double integral...

Maple
`g := (-12*y^2+1)/(4*y^2+1)^3 * ln(abs(-1+2^(1-x-I*y)));Compute Int(g, [x=1/2 .. infinity, y=0 .. infinity]).PS: this stems from How to calculate hard integral?, but it is not related to the RH.`

## any updates to Mapleprimes' board SW?...

As of today it does no longer properly load using Firefox, but using IE works

## Win7 and Compiler...

Maple 16
`I installed M16 32 Bit on my new machine with Win7 64 Bit.But the following results in crushing mserver.exe:  tmp := proc( x :: float ) :: float; 2.3 * x end proc:  cp:=Compiler:-Compile(tmp);with system info below. Do I have to set certain rights for the compiler or define a specific working directory?The FAQ http://www.maplesoft.com/support/faqs/results.aspx?search=compiler does not help me.Dito http://www.maplesoft...`

## why not cancelling?...

`Pi^2*(c+(1+Pi)/Pi)^2+Pi^2)/((c-(-1+Pi)/Pi)^2*Pi^2+Pi^2);`
`                         2 /    1 + Pi\2     2                       Pi  |c + ------|  + Pi     ...`
 1 2 3 4 5 6 7 Last Page 2 of 12
﻿