MaplePrimes Questions

Please help!

Hi guys,

I'm having trouble trying to get this feature to work.  I've defined a function, however, when I try to get execute a VolumeofRevolution command, all I get is the repeated command written in blue. ..

I've attached the worksheet.Download 6440_volume.mws
View file details

 

Thanks for any help!

Hi there,

I got two ordered lists of data (X and Y coordinates of body).

How I can plot a trajectory Y vs. X via pointplot?

Thank you in advance.

> y1 := x-> piecewise(0<=x<=c, m1*x+b1, c<x<=1, m2*x+b2);

Error, unexpected relational operator

I don't know why it gives me this error, I underline where the cursor goes. Can anyone tell me what is my error?

Thanks

Hi,

I want to know how much memory Maple "sees" as available on command line execution. How can I get the information that appears on the classic worksheet as "Bytes" and "Available" with a Maple command?

Thanks

Short question: why does > type(Not(x::posint),property); show 'true' in Maple 10 (and below), and 'false' in Maple 11? What has changed? -- Regards, Franky

Dear all,

first I use Maple 9.5:

solve(x^3-8*x^2+12*x-4,x);

gives back 3 complex roots - in this moment I again know, it isn't bug.

Then I use Maple 11 with the same result.

Next test in Maple 11:

with(RealDomain): solve(x^3-8*x^2+12*x-4,x);

gives back only 2 real roots! Way?

Thanks.  Jan

hey guys.. i have put input this in maple.. but it doesn't seem to solve it..

 

ode:= D(D(y(t)))- u*(1-(y(t)^2))*D(y(t)) + y(t)=0;
ics:=y(0)=0.2, D(y)(0)=0;
                           y(0) = 0.2, D(y)(0) = 0
dsolve({ode,ics},numeric);

Error, (in unknown) invalid input: op expects 1 or 2 arguments, but received 0

 

The F-distribution (also known as Snedecor's F distribution or the Fisher-Snedecor distribution) depends on two separate degrees of freedom, m and n. It is defined by (Eq. 2 in MathWorld):

In Maple notation:

 

> fdist:=(x,m,n)->GAMMA((m+n)/2)*(m/n)^(m/2)/GAMMA(m/2)/GAMMA(n/2)*x^(m/2-1)/(1+m*x/n)^((m+n)/2);

In order to calculate the percentage points of the F-distribution we need to find the area under the curve. For example, for known m, n the integral

 

defines the percentage of points under curve for x, since  

This can be done easily in Maple, if we wish to find, say, 95 % confidence level for m=4, n=3, we (could) do the following:

> Fstat:=proc(perc,m,n) fsolve(int(fdist(u,m,n),u=0..x)-perc,x=0..infinity); end proc:

 

> Fstat(0.95,4,3);

          9.117182253

 

Is there a Maple built-in function I can use to calculate these values in a more elegant form instead of defining fdist and Fstat?

Is there something similar for the evaluation of the percentage points of the t-Distribution? 

Graph the surfaces  y= x + z and y = 1 - z on the same axes using the domain |x| < or = 1.2 , |z| < or = 1.2 , and observe the curve of intersection of both surfaces. Show that the projection of this curve onto the xz-plane is an ellipse.

 

So that's that problem. I am so lost on what to do. I know it has to do something with implicitplot3d.

 

 

I know that student[middlebox] can graph an approximation of an integral.
For example,
with(plots):
with(student):
f:=x->sin(x)+0.2*x+0.5:
a:=0: b:=16: N:=10:
C:=plot(f(x), x=a..b):
R:=middlebox(f(x), x=a..b, N):
display(C,R);


I need to know how to use Maple to do the same plotting for double integrals. Thanks for your help.
 

Hello everyone.

 

I believe I have come across some kind of bug in Maple 11, and I was wondering if anyone could confirm that I am not crazy and that I am not using the software incorrectly.  When using the solve command, I get some very weird stuff:

 

evalf(solve(x^3+1/4 = x))

 

evalf(solve(x^3+.25 = x))

 

The second gives the correct answers.  The first gives three complex roots.  Am I doing something wrong?

 

Thanks,

John

O.k. so I can plot an arrow.  And I can plot a function.  Now how do I get them on the same plot?  Any simple example that shows how to do this will help me.  Thanks. 

For describing intermediate steps when calculating a definite integral, often in textbooks or other literature people use a square bracket on the right of an equation with the lower and upper bounds of the integral as sub- and super-script to the right of the square bracket to mean that the equation should first have the upper bound substituted into the equation and then the lower bound should be substituted into the equation and the latter subtracted from the former.  Is there any way to write this in Maple in a way that is visually the same?  I don't see anything similar in the

Find the general solution for the differential equation

x"(t) - 4 x'(t) + 4 x(t) = t * exp(2*t)

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