Maple 2015 Questions and Posts

These are Posts and Questions associated with the product, Maple 2015

Hi everybody,

 

I want to plot many curves in the form of a table.

For instance, let    p := plot(x, x=0..1, labels=[x*Unit('m'), y*Unit('m')]):

The command   plots:-display(p)  returns a plot  with labels x [[m]] and y [[m]], just as expected.

But the commands (remember I have several plots)
                             plots:-display(<p>);                              # and the generalization plots:-display(<p | p>)
                             DocumentTools:-Tabulate([p]);           # and the generalizationDocumentTools:-Tabulate([p,p])
both provide labels  x Units:-Unit('m') and  y Units:-Unit('m')

Is there a way to fix this and obtain plots withe the expected labels ?

Thank to all of you for yout help

 i need a help on how to find the local truncation error of a hybird block method of three order IVP. here is the one of the discrete methods i need to find the local truncation error. please any solution should put here thanks 

The following image shows a .mw file on two monitors (1 = right side) (2 = left side).  

Distortion occurs when I try to drag-and-drop an open file from monitor 1 to monitor 2.  Transfer from one monitor to another works fine on all other applications (.pdf, .docx, web stuff, graphic files like .png, and .xlsx.  Only .mw files distort when I try to open them or move them to monitor 2.  I was able to move, open, etc. any .mw file for over a year, then a couple of days ago the files started to distort.  I had a 32-bit version of Maple (Maple 2015.2 build ID 1097895—deleted it.  Also deleted and reinstalled Maple 2015.0, build 1022128.  I checked and updated my video card, updated the 2-monitor settings on Windows 7.  All this to no avail, the Maple 2015.0 program works on monitor 1, but it can not be opened or dragged-and-dropped to monitor 2.

Help, advice, suggestions welcomed—many thanks in advance.

Les

 

See WA30 attached.  Why the error?  The variable that represents the vector is in vector form.  If I need to change this to THAXexa := ([1988.0, 1989.0, 1990.0 , ... etc], datatype=float, is there an easy way to convert the THAXexa matrix?

Thanks, Les  WA30.mw

In Maple 2015 is there a way to fit data to an exponential model and determine the goodness of fit?

Thanks in advance!

Les

I would like to use method wsolve for solving polynomial equations. The method has been implemented by Wang: https://link.springer.com/chapter/10.1007/978-3-7091-6604-8_9

As it is written in the text the metod is part of charsets package. But I can seem to find it and active it. I can find package online (http://wang.cc4cm.org/charsets.html), but I don't know how to add it to Maple.

I need to use this method in order to prove geometry theorems (and not any other method will do) and compare my results with results of other researchers.

dear all,

I have a problem when I try to find points on boundary of the surface.

the surface ploted from a matrix as follow:

 

please help me to generate a bondary curve of this surface.

Thanks

 

 

 

Hi, everybody.

I have a problem when I try to plot3d a sub-surface from a surface as follows:


 

S := proc (u, v) options operator, arrow; Matrix([[40*u], [80*v], [10*u^2*v+20*u*v+15]]) end proc;

proc (u, v) options operator, arrow; Matrix([[40*u], [80*v], [10*u^2*v+20*u*v+15]]) end proc

(1)

S(u, v)

Matrix(3, 1, {(1, 1) = 40*u, (2, 1) = 80*v, (3, 1) = 10*u^2*v+20*u*v+15})

(2)

 

p:= proc(u,v) if u<v then S(u,v) else S(u,v)+10 end if end proc:

h:= proc(u) 2*u  end proc:

plot3d(p, 0 .. 1, 0 .. h)

Warning, unable to evaluate the function to numeric values in the region; see the plotting command's help page to ensure the calling sequence is correct

 

 

``


 

Download sub-surface.mw

sub-surface.mw

 

Please help me!

 

Thanks and have a nice day.

 

 

What is the Maple Formula for the Excel function: =WEIBULL.DIST(A1,2,6.2,FALSE)

where A1..A26 is 0..26  ?  How do I plot it?

Thank you, Les

So, i have 3 vectors:

A=2i-3j+ak

B=bi+j-4k

C=3i+cj+2k

where a,b,c are constants.

such that A is perpedicular on B and C, and the scalar product B*C=2.I have to estimate this constants using an iterative algorithm on Maple and then solve the problem using predefined function from Maple and compare the results.If you have an idea pls let me know.Thank you.Sry if I wasn't clear.

Ok, so i have this functions

where f(x) represent urban population and g(x) represent the rural population.

And i have to implement an algortihm in Maple to find out after what period of time x the rural population will be with 20% bigger than urban population.

I'm new in Maple and is a little bit hard for me to implement algorithms in this program.If you can help me with any idea, i will really apreciate.Thank you :). 

Is there a built-in function in Maple 2015 that identifies and prints prime numbers in a specified integer range?

Hi everybody,

I'm kind of new to Maple and i'm trying to solve a system of trigonometric equations inequality as follow:

f:= {((2*a*sin(S)*cos(S)^(2)))/(1-sin(S)^(3))<1,90> S>-90,a>1};

solve(f,{a,S});
Error, (in PiecewiseTools:-Convert) unable to convert

 

How can I solve the system?

Thanks a lot.

I have a code that outputs a long string of mathematics after various string replacements which I save into a file in the format of a Python function. Here is the code (for a 1 x 1 matrix):

restart:
Size:=1:
## This is the matrix which is generated in a string format
mat1:="Matrix(1, 1, [[-1/2*(A^8*hh*m3+6*A^7*B*hh*m3-2*A^7*hh*m3*z3+16*A^6*B^2*hh*m3-14*A^6*B]])":
## Open up file
filename2:=fopen(cat("Matrix", Size, "x", Size,"HH.py"),WRITE,TEXT): 

## Format file
fprintf(filename2,"import numpy as np\ndef myfuncHH(A,B):\n    z3 = 2\n    m3 = float('inf')\n    Mat_size = %a", Size): 
fprintf(filename2,"\n    arr = np.array([%a",mat1): 
fprintf(filename2,"],dtype=np.float64)"): 
fprintf(filename2,"\n    shape = ( Mat_size, Mat_size )\n    HH=arr.reshape( shape )\n    return HH"):
fclose(filename2):


This generates almost the exact output that is required:

 

import numpy as np
def myfuncHH(A,B):
    z3 = 2
    m3 = float('inf')
    Mat_size = 1
    arr = np.array(["Matrix(1, 1, [[-1/2*(A^8*hh*m3+6*A^7*B*hh*m3-2*A^7*hh*m3*z3+16*A^6*B^2*hh*m3-14*A^6*B]])"],dtype=np.float64)
    shape = ( Mat_size, Mat_size )
    HH=arr.reshape( shape )
    return HH

The part I want to remove is the "Matrix(1, 1, [   "Maths in here"   ])"]

 

I can use stringtools to tidy up most of this, but I am having trouble getting rid of the quotes of the string itself. I have tried escaping them and that does nothing. Is there a simple way to do this or will a regex have to be made?

 

- Yeti

Imagine we have an ODE system 

odeSys := {diff(x(t),t$2)+diff(x(t),t)+x(t)=f(t),diff(y(t),t$2)+2*diff(y(t),t)+3*y(t)=g(t)};

It is easy to transform this system into a first order form by hand. But for larger systems, the procedure by hand becomes very error prone. Is there an intelligent way to transform a system of n scalar ODEs (order m) into a first order system? I know that the first order form is not unique. It is only important to reduce the system to a system of first order equations.

 

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