casperyc

myf:=(mu,sigma)->int(exp(-(x-mu)^2/2/sigma^2)/sigma/sqrt(2*Pi)/(1+exp(-x)),x=-infinity..infinity);

plot3d('myf(mu,sigma)',mu=-5..5,sigma=0.5..10);

This plot was never created. I think it's taking too long to evaluate it when it's divegent.

Hi all,

For my research purpose, I need to integrate this function. I understand that there maybe values for which this integration is divegent. But is there a way to look into it? Say creat...

Hi all,

I am now helping with the first year maple session in my university. Recently, some of the student are learning both 1-d and 2-d input.

Now we have something like this:

Is this some sort of bug?

I know it has something to do with the 1-d or 2-d or math input, but in short, that's what happens.

Thanks!

Dear all,

I wrote some simple functions in Maple 13, called "myproc" file,

and used startup code (edit-->startup code) to initialize it in a worksheet by: read "myproc";

Now I am using Maple 14, it does not work, says, "unable to read", sort of thing.

I have also tried to rename the file to myproc.m and read "myproc.m";

does not work either.

Is there any compatibility problem?

Thanks.

casper

poi:=x->exp(-0.2225)*0.2225^x/x!;

for i from 0 to 4 do > evalf(poi(i)*10000,2) > od;

View 7845_Q1.mw on MapleNet or Download 7845_Q1.mw
View file details

I dont understand what's the 'label' thing in the answer here.

Thanks.

casper

Hi,

++++++++++++++++++

A:=Matrix(3,3);

ExportMatrix("A",A);

save A,A2;

++++++++++++++++++

Both 'A' and 'A2' are saved  in the same folder as the worksheet,

how can I save/ExportMatrix in a sub-folder (if folder dose not exists, creat automatically)?

Thanks.

casper

Download 7845_notes.pdf
View file details

Hi,

I am trying to go through an example in my notes.

p:=2038074743;
q:=1190494759;
n:=p*q;

x:=141213562373095048;

y:=Power(x,2) mod n;

then I do the following,

Power(y,(p+1)/4) mod p;

Hi,

I am just wondering, if dealing with 'large' numbers,

which one is better? or which is approiate?

+++++++++++++++++++++++++++

restart:
a:=[12,34,56,78,100000];
t:=time():map(i->Power(i,43214342341) mod 5423524532,a);time()-t;
+++++++++++++++++++++++++++

restart:

a:=[12,34,56,78,100000];

t:=time():
for i to nops(a) do
a:=subsop(i = `mod`(Power(a[i],43214342341),5423524532),a):
od:
a;time()-t;

+++++++++++++++++++++++++++

Hi,

Have a look at the following

+++++++++++++++++++++++++++++

test:=proc(s::string)
local M,a;
a:=rand(10..100)();
M:= Matrix([a-1,a,a+1]);
ExportMatrix(cat("Matrix_",s),M);
end proc;

+++++++++++++++++++++++++++++

test("1");test("2");test("3");test("4");test("5");test("6");

+++++++++++++++++++++++++++++

it saves in file

Matrix_1, Matrix_2,Matrix_3 .....Matrix_6

however,

Hi there,

B:=Matrix(3,4,[ListTools:-LengthSplit([1,2,3,4,5,6],4)],fill=32);

C:=[seq(i,i=B^%T)];

What's the most efficient way to delete the 'extra' 32s when converting it back?

Thanks.

casper

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
View file details

============================

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

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

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.

Hi,

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

Download 7845_not_good.txt
View file details

> read "notgood.txt";

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

on line 1, unexpected end of input

Error, while reading `notgood.txt`