MaplePrimes - Questions and Posts tagged with convert

The Million Dollar Stop Sign: What is the Cost of Stopping Your Car?

Paul — Thu, 02 May 2013 17:38:45 Z

An intersection in my neighbourhood, currently controlled by a 2-way stop, is under consideration to become a 4-way stop. This means the traffic that currently has the right-of-way will be required to come to a complete stop, wheras previously they could have coasted down the hill, and accelerated up the other side. Politics aside, I was curious to explore the following question:

Removing units with power

9colai — Fri, 29 Mar 2013 12:15:44 Z

Hi again! :-)

I just ran into another problem with units...

I want to remove all units from an expression like this one

V[dis]:=(3/100000)*Unit('m')^3+0.1e-2*Pi*Unit('m')^2*(.112-0.28e-1*cos(theta)-sqrt(0.7e-2-0.1e-2*sin(theta)^2))

I've tried with convert(V[dis],'units_free') but Maple wont let me use that command, when the expression contains units in powers (square and cubic).

I guess there is another way arround, but how?

Best regards

Conversion of trigonmetric expression to radicals

wkt — Sat, 23 Mar 2013 18:59:55 Z

Hi,

with great interest and surprise I read the post
"Converting Half-Angle Trig Formulas to Radicals".
Isnt it possible to evaluate cos(arccos(13/14)/3) also
to an exact expression in radicals ?
I simply do not succeed with my humble knowledge of
the Maple commands/internal workings...
Would be great if someone finds a solution ( of an
unsolvable problem ??? ).

[Edit: Excess white space deleted.---Carl Love]

Using RSA give your encryption as a list of three numbers.

finishimx7 — Thu, 21 Mar 2013 18:50:56 Z

Use RSA with the modulus n=119 and the exponent e=7, with the 95-character alphabet consisting of the printable ASCII characters to encrypt the word "Yes". Recall that the alphabet is given by

Alphabet:=cat(Select(IsPrintable,convert([seq(i,i=1..255)],bytes)));

so that Y=57, e=69, s=83. Give your encryption as a list of three numbers.

Converting the output of a function to a tree/graph representation

JamesK — Wed, 13 Mar 2013 20:16:13 Z

Is there any way to convert the output of ToInert to a graph/tree representation?
ToInert's output type is a function and I've tried converting it to an expression first but didn’t succeed. I've also looked for functions in the GraphTheory package that could help in this process but didn’t manage to find anything useful.
Thank you.

writing data to a file

enrica — Tue, 19 Feb 2013 11:22:04 Z

writedata("C:\\duffy\\mapleprogramme\\relevant\\conditional optimal\\optimal3", css, float);
> convert(css, matrix);

I used the above command to save data into a file but it didn't work. I also used the comand export (which would be better) to save data in one excel column, but it didn' work either, could you please help me understandig how can I save data? The data appear in the programme with this format:

Matrix(1, 1, {(1, 1) = .73951725}), Matrix(1, 1, {(1, 1...

Problem with subscripts

Sergio Parreiras — Fri, 08 Feb 2013 23:26:15 Z

I need to use subscripts to define a system of equation and its respective variables. I do not encounter any problem when I use solve or Basis (with Groebner package) but when I tried to use RealRootCounting (with RegularChains and SemiAlgebraicSetTools packages), I got the following error message:

Error, (in RegularChains:-SemiAlgebraicSetTools:-RealRootCounting) invalid input: TRDnearsolve expects its 5th argument, vlist, to be of type list(symbol), but received [p[1], x[1], q[1], u[1]]...

Sums of the Vector's Components

trottaleonardo — Wed, 06 Feb 2013 15:35:43 Z

Hi, I use Maple 13 and have this issue to solve.

In an archive.txt there is the following Vector:

-1/64*cosdincl^2*cos(2*ele-2*g-2*anom-2*w)
+1/16*sinfJ*cosfK*sindincl*cos(2*ele+g-h+om-2*anom-2*w)
-1/16*sinfJ*sinfK*cosdincl*cos(2*ele-g-2*h+2*om-2*anom-2*w)
+1/16*sinfJ*cosfK*sindincl*cos(2*ele-g-h+om-2*anom-2*w)
-1/16*sinfJ*sinfK*cosdincl*cos(2*ele-g+2*h-2*om-2*anom-2*w)
+1/16*sinfJ*cosfK*sindincl*cos(2*ele-g+h-om-2*anom-2*w)
+1/128*cos(2*ele+2*g-2*h+2*om-2*anom-2*w)

Converting the bessel function product in terms of a polynomial

maplelearner — Sat, 12 Jan 2013 09:21:51 Z

Dear Users,

I would like to know how to convert the following bessel product into a polynomial form.

I have an experession as follows:

BesselI(1,p*x)*BesselK(0,p*x)+BesselI(0,p*x)*BesselK(1,p*x) #where p is arbitrary real positive constant and x is a variable

How to get the result in maple by simplify, convert or any other functoins.

Thanks for your attention.

convert/Matrix backwards to Vector[row] ???

casperyc — Sun, 16 Dec 2012 18:17:27 Z

Hi all,

A := [[1,2],[3,4]];

A1:=convert(A, Matrix);

I am very happy with conversion between Matrices and Vectors.

However, I does not seem to be able to do this backwards to [row] or [column] Vectors???

Say how do I get back to A from A1???

I tried to use

convert(A1,Vector);

convert(A1,Vector[row]);

convert(A1,Vector[row],2);

And many others...

Convert/print the integers in float format

vineetloya — Fri, 14 Dec 2012 22:35:35 Z

Hello,

I am working on a project where Maple's output is fed to another software which requires all it's input in specific format. So, I want to print this expression,say

y=+2.*x+.2, in this software, but it takes input as

y=2*x+0.2, So now I have to change

+2. to 2.0 or 2 (if it's starting of the equation)

-2. to -2.0

.2 to 0.2

Is there any way to convert all the numbers in the equation to...

how to stop maple from evaluating my solution and pass as string

vineetloya — Wed, 12 Dec 2012 18:52:17 Z

Hello,

I am working on a Maple project and it require me to pass a differential equation in a specific order like

x'=y & y'=x^2.(It is differentaiting w.r.t 't'(say))

However when I convert the equation into string it converts something as

diff(x(t),t)=y(t) & diff(y(t),t)=x(t)^2

Is there any way to stop maple from evaluating into maple/math format?

Is there any way to pass an equation without changing it's existing form?...

how to convert this integration into a function in terms of gamma?

williamov — Tue, 11 Dec 2012 11:57:05 Z

i got two density, the part of it is similar the pattern of gamma, how to convert it into an expression of gamma times something?

test2 := x*Diff(P,x$2)+(a+1-x)*Diff(P,x)+mu*P=0;
Density := int(exp(-X*(I*u-a*i))*(-i*X)^(-a), X = -infinity .. infinity);

test2 := x*Diff(P,x$2)+(a+b-x)*Diff(P,x)+mu*P=0;
Density := int(-exp(-X*(I*u-a*i-b*i+i))*(-i*X)^(-a-b)*i*X, X = -infinity .. infinity);

how to convert a parametric equations back to in terms of x and y with maple?

marram — Fri, 07 Dec 2012 12:59:33 Z

x = a*(3*cos(t) - cos(3*t))
y = a*(3*sin(t) - sin(3*t))

is there a library or function to convert above parametric equations into one equation in terms of x and y?

sys := x = a*(3*cos(t) - cos(3*t));
k := solve(sys, t);
simplify(subs(t=k[1], y = a*(3*sin(t) - sin(3*t))));

any simpler form?

convert list of numbers

brian bovril — Sat, 01 Dec 2012 13:21:32 Z

hi,

is there a procedure to convert a number (or list of numbers) into its english equivalent?

1 = "one", 2= "two", ......, 100 = "one hundred"