Where Re(M) seems to work fine, Im(M) does not
I already found out which procedures to use instead: Re~(M) and Im~(M).
But still, it looks like

Re(M)=Re~(M)

am I right, or what's the difference between those two?
BTW, I didn't find a page about Re~/Im~ and was wondering..

I've solved a PDE with pdsolve, I can get the value of u(x,t) at a certain x and a certain t with the value command, K := pds:-value(x = 1-b, t = 0 .. 1, output = listprocedure) leads to; [100.*(x(0) = .99), 100.*(t(0) = 0.), 100.*((u(x, t))(0) = 2.40908278321669992*10^(-93))] id like to get the u(x,t) value out to put it in a function, is there a simple way of doing this? Thanks, Ryan

Okay so I do have those two objects of type Array, from which one has 'Data Type: anything' and the other 'Data Type: float[8]'. I get this information by using the procedure 'properties'.
What I now wanna know is: How can I change a specific property from an Array like the above mentioned for example?

<p>Hey,</p>
<p> </p>
<p>How do I set up a loop that resets if a certain condition is met? </p>
<p>I have set up a loop that pulls and runs an external process. However, if certain conditions are met, I wish the loop to reset from the beginning and take the last output from the process as the new input.</p>
<p> </p>
<p>Example:</p>
<p>for i from 1 to 10 do</p>
<p>     tester:=baseset[i]:</p>
<p>     tester:=process(tester)[1]:</p>
<p>     check:=process(tester)[2]:</p>

Hi all,

 

I am after some advice on how to extract a value from a proc.

 

below is the system of ODE's im trying to solve, however i get this error which i cannot get round, can anyone help?

 

At the moment I'm trying to find the smallest difference between two things (of form E[i] i goes from 1 to n)  and input them in a list. To do this I need to use nested loops but I'm not sure of the best kind/way to do this. I have been experimenting with for and if loops so far

for instance, this is my most recent effort.
 

for i from 2 to n do;

a := abs(E[i]-E[1]);

for j from 2 to n do;

if i <> j then ;

b := abs(E[i]-E[j]);

end if;

if b < a then a := b end if;

end do;

<p>Hello</p>
<p>I am trying to assign equations:</p>
<p><img src="http://img121.imageshack.us/img121/9821/assign.jpg" alt="" /></p>
<p>But i get the invalid arguments error. What is the problem?</p>
<p>Thank you</p>

How can I use algorithmic variables in multiple parts of a multipart question? We used to do it like in the Tips & Techniques document http://www.maplesoft.com/tacontent/view.aspx?SID=5390. Now, the variables from the question algorithm seem hidden from the parts.

When I create the multipart question through the question editor, I get the following script:

mode=Multipart@
name=Multipart@

 

I attach the relevant file but in essence I have a function which includes a term sin(x+a+b) where x is the variable and ‘a’ and ‘b’ are constants, symbolic integration and solving then follow.

I may have stumbled upon a loop quirk

for m from 1 to 5 do
  m;
end do;

From this program

S1:=unapply(u*FresnelS(u)+((1/Pi)*cos((1/2)*Pi*u^2))-(1/Pi),u);

C1:=unapply(u*FresnelC(u)-((1/Pi)*sin((1/2)*Pi*u^2)),u);

R1:=1;

u1:=evalf(sqrt(0.4));

E1:=evalf(Pi*R1*S1(u1)+R1);

D1:=evalf(Pi*R1*C1(u1)+1);

a:=evalf(Pi*R1*(u1));

with(plottools);

with(plots);

c1 := circle([D1,0], R1);

display(c1);

plot([a*FresnelC(u),a*FresnelS(u),u=0..u1]);

p1:=plots[display](plot([1+a*FresnelC(u),a*FresnelS(u)-E1,u=0..u1]),c1,scaling=constrained);

h := Array(1..2^16,datatype=float[8], storage=rectangular, order = C_order) # of hfarray
x:= Read(clarinet): # of Array
ArrayTools[Copy](x,h):

First, I have the following object:

H := Array(1..2^16,datatype=float[8], storage=rectangular, Order = C_order).

Now, I try to find out which type it has:

whattype(H),

and it only tells me 'Array', but it's fare more than that: datatype=float[8], storage=rectangular etc. etc.

If I'd change a setting in this array and try to store it into the original, Maple would give me a type clash error.

But how to find out these types?

Hi,

I would like to know how to pass my list of initial conditions "a" in to my solutions via some form of index to generate plots for each of my initial conditions. I have indexed in the code but need some form of related calling procedure.

 

Thanks in advance.

 

>restart;

> eq:=diff(y(x),x,x)+y(x)^2*x^2=x^2;

> a:=[-0.6,-0.4,2.4,3.4];

> ics[1]:=y(0)=0,D(y)(0)=a[1];

> sol[1]:=dsolve({eq,ics[1]},numeric);