Importing Data in Maple

Posted on 2008-11-20 18:15 By Dirk (

21)

Categories:

How do I ...? with Maple (Student)

I have a problem and hope, anybody can help me with that.

I have density data dependig on temperature and pressure. The data are stored in an excel file (in a square block - see attachment). Is there an easy way to import this data in Maple, that I can use several values of the density at given a pressure and temperature? Maybe comparable with a table (or matrix) where you can pick out indexed values, e.g. rho[temperature,pressure].

My current solution is to write a procedure, but before that I would like to know if there is an easyer way.

Another point is, how to plot this data. A possibility is with matrixplot, but the values of the x and y axis are not related with the given pressure and temperature but with the row and column numbers.

Download 6629_Density.xls
View file details

ExcelTools:-Import

Comment on 2008-11-20 18:52 from acer ( Maple Rating 4

1410)

Do the values in Matrix M appear correct, if you run this code below?

A := ExcelTools:-Import("Density.xls");

interface(rtablesize=50):
M:=Matrix(A);

There are several plotting choices available. This is just one such (presuming that I've interpreted the data structure ok),

plots:-pointplot3d([seq(seq([M[i,1],M[3,j],M[i,j]],j=2..6),i=4..11)],
                   axes=boxed,symbol=solidcircle,
                   labels=[Temperature,Pressure,Density]);

acer

ExcelTools

Comment on 2008-11-20 18:52 from Robert Israel ( Maple Rating 4

1555)

> with(ExcelTools):
   A:= Import("6629_Density.xls");
  Temperature:= convert(A[4..11,1],list);
  Pressure:= convert(A[3,2..6],list);
  Density:= Matrix(A[4..11,2..6]);
  plots[surfdata]([seq([seq([Temperature[i],Pressure[j],Density[i,j]],j=1..5)],i=1..8)],
      axes=box,labels=['T','P','D']);