When integrating 1/x as int(1/x,x) the answer is ln(x) while it should be ln(abs(x)). How does one fixes this mistake?

@epostma Thank you , that really worked. My next question is, if the raw data is in a text file, other than data pasted into excel, how can i import the the two columns of data and do the similar calculation?

The text file is attached.

[0, 0, 0]
Voltage_1 (1) Current_1 (1)
+2.084844E-03 -1.539501E-11
+1.008272E+00 +7.418045E-11

Consider the following expression:

sCARA4 := -ln(-(mu/sigma^2)^(mu^2/(mu-sigma^2))*(sigma^2/mu)^(mu^2/(mu-sigma^2))+(sigma^2/mu)^(mu^2/(mu-sigma^2))*((exp(phi)*sigma^2+mu-sigma^2)*exp(-phi)/sigma^2)^(mu^2/(mu-sigma^2))+1)/phi;

Now try to find out whether the first derivative to mu is positive for all positive mu, phi and sigma, except for some rare exceptions (e.g. sigma^2=mu).

diff(%,mu);

Since 'is' is not a satisfying option, I used 'Explore'...

hi

please help me to solve this error.

Error.pdf 

Hello,

I have Tetrahedron and I know all it's points I need to compute it's volume.

I have computed the square of the triangle and all I need is the hight.

Please give me an answer including vectors.

Thanks a lot.

Hey everyone.  I'm having problems solving a set of complicated PDEs.  I found a question before that helped me a bit, but the answer was less than ideal.

Here is what I have so far.

pde := [-1/4*Gamma*(Gamma-2)/r^2*G(v,r)+1/r^3*j[v](v,r)*Gamma-1/r*diff(h[vv](v,r),r)-1/r^2*h[vv](v,r)+1/2*1/r^2*diff(j[v](v,r),r)*Gamma = 0, 1/4*f(r)*Gamma*(Gamma-2)*G(v,r)/r^2+1/r*f(r)*diff(h[vv](v,r),r)+1/r*diff(h[vv](v,r),v)-1/r^2*f(r)*diff(j[v](v,r),r)*Gamma-1/r^2*diff(j[v...

maple_error.doc

Hello,

I have a plane x+2*y+3*z = 0 and a point A(1,2,3).

From A there are 3 lines :

P := (1, 2, 3) P1 := (-1, -1, 0) L1 := P+t*(P1-P)

How to find the cutting points between L1 and the above plane?

How to find a cutting points between planes? 2 3 4 planes etc.

It is urgent, please help me!

How do you map b into a to get [[a1,a2,b1],[a3,a4,b2],[a5,a6,b3]]

a:=[[a1,a2],[a3,a4],[a5,a6]]
b:=[b1,b2,b3]

Hello Colleagues:
I have tried to develop in Maple as shown in the following Gif.

What I've achieved is these few lines of commands:

I have the following script 

Download display_plot_-plot_s.mw

, where i tried to import two collumns of data from excel, what am i suppose to put after "display" to obtain the plot?

How do I evaluate moments of Q4 in a reasonable time with a reasonable accuracy, i.e. to a few decimal points:
   
with(Statistics): RV := 'RandomVariable(Geometric(1/3))+1'; R := `$`('RV', 5);

Q4 := 1/(alpha*R[1]+alpha^2*R[2]+alpha^3*R[3]+(1-alpha-alpha^2-alpha^3)*R[4]);

Moment(Q4, 1);

E.g., can I tell maple that replacing infinite series underlying this calculation with sufficiently long partial sums is okay with me? Or maybe there...

Hi friends,

I have windows 7, 64 bits, and I upgraded my maple to 64-bits version as well (Maple 13.02). But I wonder why in the task manager of windows, maple is still tagged as a 32 bits application (e.g. "maple.exe *32"  and  "mserver.exe *32")? In fact, I think the reason that I cannot run one my maple projects, which needs more than 2GB RAM, comes from this issue. Could you help me resolve the problem?

Thank you!

Hi all!

I would like to isolate a variable from an equation but after trying both solve and isolate I noticed they result in two different solutions. Which one is correct or in other words are there any issues with my syntax resulting in these differences?

To my mind I did all the necessary assumptions, to avoid that the summand will become singular when calculating the expected value.

What did I do wrong?

Here´s the code:

with(Statistics):
interface(showassumed=0):
assume(t::posint):
assume(x::posint):
assume(0 < q, q < 1):
X1 := RandomVariable(Geometric(q)):
DARA := t->log(t):
ExpectedValue(DARA(X1));