restart;
sign(-v1+a);
sign(-V1+a);

my respective outputs are

1
-1

I cannot understand what is the difference between using lowercase and uppercase variable. Could Someone Explain me please.

I have to Two Lists with Equal size. Each element in one List is an variable and Each element in second List is an Value of the variable corresponds to First List.

Now when Ever I call a variable I need the script to read its value and Compute.

For Example:

List1 := [v1,v2,v3,v4];
List2 := [a*b/c, a/c,a*b-2,d];

computation := v1*diff(expression,x)+v3*diff(expression,y)+ v3*v4;

but I need the script to read it as

requiredComputation :=(a*b/c)*diff(expression,x)+(a*b-2)*diff(expression,y)+ a*b-2*d;

I used to do this kind of computation in matlab using containers and map. Is there any thing similar??

I was trying some calculations for a solar installation.

4.9kW system. 3.5 h sun/day.  $0.27/kWh

restart:
with(Units:-Standard):
                     "maple init loaded..."
4.9*Unit(kW)*3.5*Unit(h/day)

714.583333333333*Unit('W')

but I want it to output 17.15 kWh/day

I looked up previous questions, and got this rather convoluted solution:

restart: 
Units[AddSystem]( NewSI, Units[GetSystem](SI), kWh/day );
 Units[UseSystem]( NewSI ); 
combine( 4.9*Unit(kW)*3.5*Unit(h/day), units ); 

17.15*Unit('kWh'/'d')

Hi. I hope this question is not a duplicate of my previous question. Fundiff function results in dirac terms in an equation. Are there commands that simply differentiates a term that is a function of (t) in an equation without involving diracs?

Can we change the color of the units measure?

ie 5 m (5 meters - where m is default black) can the m be changed to a different color for all unit measure entries?

MY CODE:
 

with(Physics);
Setup(mathematicalnotation = true);
Setup(Coordinatesystem = (X = [x, y, z, t]), metric = 4*dx*dt-dy^2-dz^2+4*u*(dt^2));
    * Partial match of  'Coordinatesystem' against keyword 

       'coordinatesystems'
    Systems of spacetime Coordinates are: (Xequals(x,y,z,t))
[coordinatesystems = {X}, 

  metric = {(1, 4) = 2, (2, 2) = -1, (3, 3) = -1, (4, 4) = 4 u}]
g_[];      (here g is diplayed in matrix form)

Weyl[alpha, beta, mu, nu, nonzero];
            Physics:-Weyl[alpha, beta, mu, nu] = {}

So basically i'm trying to find the nonzero components of the weyl tensor which returns the empty set, i.e the weyl tensor apparently equals zero but I know this is not the case, can anyone see if I have input something wrong? Thanks in advance

g_[] in matrix form is 
0 0 0 2
0 -1 0 0
0 0 -1 0
2 0 0 4u

UPDATE: u is a function of all varibles and I have not considered this which might be causing the problem

I trying to get a proc to work. In the 1st half of the document, I derive four sections for a pedal curve and plot them fine. In the second I try doing it with a procedure called Pedal. Am having problems. I think it might be something to do with the for.. do loop. 

Download Proc_for_Pedal_not_working.mw

Hi all

I have the following ordinary differential equation, where all the parameter used are constant ( A,B,C,D,E,F,G,H).

Is there any technique gives a solution
diff(y(x), x$2)+(A/x+B/x^2+C)*(diff(y(x), x))+D*(diff(y(x), x))^2/x+E*(diff(y(x), x))^3+F/x+G/x^2+H/x^3 = 0;

 thanks for your help

Dear all;

I hope an idea to solve the following problem.

P(n,t): probability at time t

Lambda and mu : two given parameters ( can be fixed ), and we assure mu greater then lambda

 t : time parameter ( we can say that 0<= t <=T , and T fixed ) 

 for n an integrer  greater then 1 we have the following equation

eq := diff(P(n, t), t) = -(lambda+mu)*P(n, t)+lambda*P(n-1, t)+mu*P(n+1, t);
 

for n=0, we have

ics := diff(P(0, t), t) = -lambda*P(0, t)+mu*P(1, t);

How can we compute P(n,t) ,

is there an exact solution or a numerical method to get the value of P(n,t)

Then we plot( P(n,t),t=0..100) ;

Many thinks

Can somebody please help me with this assignment?
Struggling a bit with the Euler-method from task d) and further.

Download luythua.mw

From the screenshot we see that Maple has correctly replaced a in the defintion of s. But it has not incorported v[B]. I was a SMath (free from internet) user and this was a simple operation.

Thanks for any advice.

SymbolicEval.mw

How do you can convert g into ?

Can you help me?

Hi

I am trying to evaluate a function that contains an infinite sum. I need to evaluate the integral to determine a CDF, and from that hopefully the inverse CDF in order to sample the corresponding PDF.

The sum comes from a 2F1 hypergeometric function, which I have written manually in the attached file.

Can anyone tell me if and how it is possible to evaluate this integral, with respect to x?

I have inserted an image below, but also the entire file :) Marginal2.mw

Thanks in advance.

Maple 2018 starts but block and hangs after the first imput.

Even after a clean install on a clean disk where there are no old files of maple.

My specs are: WIN10 pr 64/ I7 /16 GB/ SSD

Who has the same problem and a sollution?