## Different cmaple faces

Maple
Yesterday I posted few screenshots of Maple 10. Here I am adding few different cmaple looks in Windows.

## round to a certain number of digits after the deci...

How do I round to a certain number of digits after the decimal point? Is there an easier way than the one shown below? > number:=12.3678918; > before:=trunc(number); > after:=number-before; > afterrounded:=evalf[2](after); > roundednumber:=before+afterrounded;

## format a string consisting of numbers and and anot...

How do I format a set of strings consisting of numbers and normal text strings. I want to label a color bar like it is shown below. Each last digit of a number should be below the last digit of the number in the string above. Is used the following command to create the label of the color bar: c:=textplot([seq([2.42,0.05+i/5*0.95,Join([convert(2*100*i/10,string), "*(max(energy)-min(energy))"])],i=0..5)],align={RIGHT}) P.S.: What is the maximum file size of an attachment to a post? I couldn't attach an image that's 8kb big.

## calculate the local maximum of a procedure...

How do I calculate the maximum value of a procedure within a defined region. I want to calculate the maximum value of the procedure p for Ia_IaLGmax=0..2, Ua_Ue=0..1. How can this be done in maple?

restart;
with(plots):
Ue:=75;
L:=5*10^(-6);
f:=80*10^3;
T:=1/f;
factor:=1000;
E_con:=1/2*L*(Ia_IaLGmax*Ue/(8*L)*T+1/2*Ua_Ue*Ue/L*(1-Ua_Ue)*T)^2;
E_dis:=1/2*L*((Ue-Ua_Ue*Ue)/L*(1/2/(Ua_Ue-1)*(-(Ua_Ue-1)*Ua_Ue*Ia_IaLGmax)^(1/2))*T)^2;
helpvariable:=Ua_Ue=(Ua_Ue)^2/((Ua_Ue)^2+1/4*Ia_IaLGmax);
boundary:=solve(helpvariable, Ia_IaLGmax);
p:=proc(Ia_IaLGmax,Ua_Ue)
if Ia_IaLGmax<=(-4*Ua_Ue^2+4*Ua_Ue) then factor*1/2*L*((Ue-Ua_Ue*Ue)/L*(1/2/(Ua_Ue-1)*(-(Ua_Ue-1)*Ua_Ue*Ia_IaLGmax)^(1/2))*T)^2 else factor*1/2*L*(Ia_IaLGmax*Ue/(8*L)*T+1/2*Ua_Ue*Ue/L*(1-Ua_Ue)*T)^2 end if end proc;

## How to modify a compiler flag?...

Compiler:-Compile uses a preset set of compiler flags. But for example I would like to replace -O2 by -fast, which is a special flag for the Mac G5. Is there any way to do this? I would even be willing to dig into the Maple code responsible, if I knew where to dig.

Bob.

## density plot with color gradient and corresponding...

I am working with Maple 9 and I am trying to create some kind of density plot similar to the one shown below this message (this one was created with matlab). I haven't yet figured out how to get a density plot with a color gradient and a scale (or legend) at the site of it which shows which color corresponds to which density value. Actually I want to plot a capacitor (or inductor) current and stored energy in an inductor (two different diagramms) which are depending on the input current and the output voltage. This should happen in a similar diagramm shown below. I would be very thankful if you could help me to solve this problem.

## Calling Convention for External Assembly Code...

I've looked at Alec Mihailov's interesting web page describing how to use the Microsoft assembler (MASM) to create a DLL that can be called by a Maple procedure. I'm attempting to rewrite the code using the GNU assembler (as) and have a few questions. Page 331, section 6.2 of the Maple 10 Advanced Programming Guide states that, to create a DLL, "the external library functions must be compiled by using the `_stdcall` calling convention, which is the default under UNIX but must be specified when using most Windows compilers." This leaves me somewhat confused. My limited understanding is that the stdcall calling convention has two effects:

## Maple Demo Screenshots

Maple
Here are some screenshots of Functioning Maple V R1 DOS demo (circ. 1991).

## Binomial coefficients mod 2

Maple
Recently I was asked in a private email about the fastest way of calculating of binomial coefficients mod 2 in Maple. It shouldn't be a problem for anybody reading my assembly dll creation manual. Anyway, here is the assembly code,

## Mktime

Maple
With Maple being able to access dll functions, it is easy to produce a function giving the epoch from the date and time. I give an example here for doing that with Open Watcom compiler included in Maple's distribution for Windows.

## whats this "Evaluate_result" mean?...

Hi does it happen to you that when you evaluate an expression in maple or maplet you get this message,"Evaluate_result"? What this really mean?

## Getting TimeZone from FormatTime...

The help page for `StringTools:-FormatTime` states that the `%Z` specifier returns the time zone, if available. On my system (linux), it just returns the string `"???"`. For example,
``` StringTools:-FormatTime("%Z");
"???"
```
Is there a way to get this to work?

## nested piecewise functions...

Does anyone know if there is a way to create/display nested piecewise functions in maple? I want a piecewise function where the conditions are themselves piecewise functions. Is that even possible?

## Solving a simultaneous equation with angles and di...

After analysing a sketch I came up with two equations describing the sketch.

My first equation looks like: eq1 := tan(X/2) = Vt/Hr;
My second equation looks like: eq2 := tan(X) = (V-Vt)/Hl;

I know the values for Hr, Hl, V so I am left with two unknown values which is angle X and distance Vt.

I have typed these equations in Maple 8 and when I substitute the values Hr, Hl, V then Maple does come up with the correct solution to either angle X or distance Vt. My problem is that I do not want the specific answer to this problem. I need a general answer. That means I want an equation where I can put in any legal values for Hr, Hl, V and then the equation will calculate either Vt or X for me.

## comments in maple code...

Is is possible to add comments in Maple code without gyrating through the LanguageDefinition? Below is a sample that shows an embedded comment - it would be nice if this were possible.
```fn := proc(n)
local x;

# here's my math
x := n + n;

end proc;

C(fn);

int fn(int n)
{

// here's my math
x = n + n;

return x;
}
```
 First 1735 1736 1737 1738 1739 1740 Page 1737 of 1740
﻿