I'm not sure why I get an error in the following simple maple code:

test:=s->fsolve(t^3=s,t);     % Simplified implicit expression for illustration.      

test(8);  % (this yields the answer 2 - good)

plot(test(s),s=0..8);

Error, (in fsolve) s is in the equation, and is not solved for

Why do I receive this error?

Same error occurs with:

fdiff(test(s),s=1);

I'm a casual user of Maple...

Here's a Maple trivia question: There is a Maple symbol that cannot be used as a procedure parameter. As far as I can tell it is the only one. What is it?

Does anyone know why png is not listed in the help on plot/devices?  The png device exists and works.

Also, are there any other unlisted plot devices?

I have reason to believe that the expression below is a real number: 

(1/6)*(-108+(12*I)*sqrt(1419))^(1/3)+10/(-108+(12*I)*sqrt(1419))^(1/3)+1;

A numerical approximation supports that. How can Maple help here to get a simplified expression?

Hi there,

i would like to know, how can i change the x-axis labels of an graph?

Currently i read data from text file in format like this:

0 10

1 11

2 14

3 15

This values i plot in a graph with this commands:

averagedValues := readdata("mytextfile.txt", [integer, float]);
plot({averagedValues}, x = 0 .. averagedRowCount)

My problem is, that each x value has a date label....

At any age we, being somewhat children, ask that. Here is the answer to such a question related to Maple. Let us consider the ODE

ode:=(2x^2-x-1)*y''(x)-(4x^3+x-2)*y'(x)+(4x^3+2x^2-2x+2)*y(x)=0;

and its general solution done with Maple

dsolve(ode);

y(x) = _C1*exp(x^2)+_C2*exp(x)*x.

The first thought is that Maple, mimicking the solution done by hand, finds a particular solution of the equation in the form y*(x)=exp(a*x^2+b*x). It fits...

Is it possible when solving a differential equation to get the corresponding recurrence relation of the series expansion instead of the actual solution?

e.g.

ode:=y''=omega^2*y(x)

the solution is obviously exp(\pm omega*x)

But I want

a_(n+2) = omega^2/(n+1)(n+2) * a_n

or something like that

I was born on the fourth day of december in 1982 and in next 19 days i am the member of

mapleprimes for exactly 4 years ...

i read about the history of maple , so i noticed it is as old as me :) lucky fo me !

then i interested to know whether is there any special event in the maple lifesplan on my birth day ?

I am not sure if this is a general problem.  And I am considering the best way to evaluate the expression (Equation) when it contains variables which have been modified by using assume.   Here is a tiny test example:

restart;
assume(a>0,x>0);
int(int(x^2/y^2,y=1/x..x),x=1..a);S:=%:  
                        1  4   1   1  2

t0 := arccosh(lambda/(s*(1-lambda)))

f := int(sqrt(lambda-s*cosh(t)/(1+s*cosh(t))), t = -t0 .. t0)

s := 1/10

with(Student[Calculus1])

g := f-Pi*(0+1/2)

Roots(g, lambda = 0 .. 1, numeric)

Why does maple say:

Error, (in mod/Expand) too many levels of recursion?

r(t) = RootOf(Int(_a/sqrt(-4*_a^4+5*_a^2-1), _a = 1 .. _Z)+t), r(t) = RootOf(Int(_a/sqrt(-4*_a^4+5*_a^2-1), _a = _Z .. 1)+t), r(t) = RootOf(Int(_a/sqrt(-4*_a^4+13*_a^2-9), _a = 1 .. _Z)+t), r(t) = RootOf(Int(_a/sqrt(-4*_a^4+13*_a^2-9), _a = _Z .. 1)+t)

ist my result of an ODE

g := dsolve([oder, r(0) = 1, (D(r))(0) = 0])

oder := diff(r(t), t, t) = 4*sqrt(1-(diff(r(t), t))^2)+(1-(diff(r(t), t))^2)/r(t)

Now usually maple gives me one solution, so I can just plot with

I'm fairly sure I discovered a bug with the Maple 17 Calculus Integration tutor.

I was working on int((x^2+2*x)*cos(x), x);.

The first step that the tutor wants you to do is to rewrite the integral by factoring out an x from the first term, and changing cos(x) to -sin(x).

The next step is to rewrite it again, this time changing sin to cos, making the intergal  -x(x+2)cos(x)

Next, the tutor distributes the X again, making the integral -(x^2+2*x...

In the following code, why is B returned unevaluated?

restart:
A:= a:  B:= 2:
F:= _a-> eval(`if`(A,B,C), a= _a):
F(true);
                               B
eval(B);
                   ...

-(1/2*I)*(I*Pi*ln(2)-I*Pi*ln(g+4)-2*ln(2)^2+2*ln(2)*ln(g+4)-2*ln(2)*ln(-1/2*I)+ln(g+4)*ln(-1/2*I)-ln(g+4)*ln(2*I)+ln(-1/2*I)*ln(4-g)+ln(4-g)*ln(2*I))/Pi

why doesnt maple simplify this expression any further?

I tried radnormal and simplify.

but he complains when using combine saying:

Error, (in combine/ln) second argument must be a maple type

Why is that?

Yesterday I’ve updated to the new Version 17.01 and now I’ve the problem that I cannot enter  ‚}‘ and another problem is an exponent e. g. x^2. To enter it I have to write x^22. The first number is not shown in the worksheet.

I hope someone can help me to solve this problem.