I've got what turns out to be just a lot of algebraic manipulation - something Maple should rock at. But I can't seem to get things to turn out just right. I have a system of equations in the variable 's'. These are the equations of 3 op-amps, and I'm looking for the transfer function Vo/Vin. V1 and V2 are intermediate voltages at specific nodes, with R1-6 and C1-2, being parameters. V1 = -R2/R1*Vin, V2 = -Vo/(C1*R4*s)-V1/(C1*R3*s), Vo = R6*V2/(R6+R5)+R6*Vin/(1/(C2*s)+R6)

Hi,

The aim is simple. For some defined procedures, I would like to load them with one single line, and show the 'welcome' message, then be able to use the procedures.

Download 7845_test.zip
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============================

In 'hello' file,

Hi,

How can I ExportMatrix/ImportMatrix without specific column(s)?

say I want to ExportMatrix(M,filename) without the last column?

Thanks.

casper

I found on the internet a basic definition of mean reversion ( http://mathworld.wolfram.com/ReversiontotheMean.html )

I would assume such definition would also work as an definition of stationarity:
 

" Reversion to the mean, also called regression to the mean, is the statistical phenomenon stating that the greater the deviation of a random variate from its mean, the greater the probability that the next measured variate will deviate less far. In other words, an extreme event is likely to be followed by a less extreme event."

Hi,

errors such as

"Error, (in ImportMatrix) file or directory does not exist"
"Error, Matrix index out of range"

can I redefine the error message in a procedure?

say if "Error, (in ImportMatrix) file or directory does not exist" happens,

I want it to printf("You have not got the message yet.")

Generally, what shall I be looking for in the help in Maple?

 

Thanks.

casper

 

for what value or interval of p (-infinity < p < infinity) the following is valid

 

(1+x)^(m+1) > (1+x^m)* 2^m

 

here x > 1

Hi,

 

myproc:=proc(name)
local i;
i:=10;
save i,"i_name";
end proc;

myproc(bob);

basically, I want to save the value i in the file that has name i_bob in this case.

how should I do that?

and dose it work the same way with Matrix? say I would like to Export a Matrix with name Matrix_bob, (or whatever I input in the myproc proceudre? )

 

Thanks.

 

I have a system of five big big big differential equations with a lot of Sin and cos. The system is not complex itself but we have complex  initial condtition?

How can I solve my system with maple with dsolve or something else?

 

Thanks

 

Have attached a worksheet with some questions about getting easy to read answers when solving a trigonometric equation and some other things using the context menu.

P.S. I use mapel 12

Edit: removed duplicate content (moderator)

Hi,

How can I read a file that has " in the context correctly? (see the attached file)

Download 7845_not_good.txt
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> read "notgood.txt";

Warning, incomplete quoted name;  use ` to end the name

on line 1, unexpected end of input

Error, while reading `notgood.txt`

 

Edit

problem with phaseportrait use of DEtools....

Asked by: Euclid 698

+ Add Tags

October 18 2009

0  4

question1:

DEtools[phaseportrait]

([diff(y(x),x)=-y(x)],y(x),x=-2.2,[[y(-2)=2],[y(-2)=1],[y(-2)=-2]],dirgrid=[17,17],arrows=LINE,axes=NORMAL);

This is the version in Maple 7?

After accessing to the help file,maybe it should be

with(DEtools):

phaseportrait(diff(y(x),x)=-y(x),y(x),x=-2.2,[[y(-2)=2],[y(-2)=1,[y(-2)=-2]],dirgrid=[17,17],arrows=LINE,axes=NORMAL);

but can't generate the resuls.

dirgrid seems not exist in the help.

 

question2:

Edit

how to generate n-Simplex elements ?...

Asked by: Euclid 698

plotting simplex + Manage Tags

October 18 2009

0  4

http://en.wikipedia.org/wiki/Simplex

Edit

for what value the function is increasing and decr...

Asked by: Lonely 400

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October 16 2009

0  6

 

for what value(s) of m the function is increasing (Xderivative > 0)/decreasing (Xderivative < 0):

 

m * log(x) / 2^m + (1-x^m) / (1+x)^m