MaplePrimes - answers and comments on Question, ... import data from a .txt file?

I just have seen, that the

Britzel — Thu, 22 May 2008 20:48:51 Z

I just have seen, that the copied and pasted text lost it's formation here in the post: So the "Columns" are well structured, number under number - but it arent columns in the sense of a Excel file or something, its just a .txt file, with spaces inbetween. I could also uload the file in the webb if some1 wants to try it for me.

readdata

Mariner — Thu, 22 May 2008 21:07:42 Z

Gernot,

Please see ?readdata.

Hope this helps.

J. Tarr

hi there, thx for

Britzel — Thu, 22 May 2008 21:17:05 Z

hi there, thx for answer, Doesn't help that much yet ;). I allready found the Data Import assistant, but all the options i can choose there don't tell me uch, as i am not familiar with all this datatype stuff. What i have is a normal .txt file. They are in a sort of ordered form. Between the 1st and the 2nd column there are 5 "spaces", between the 2nd and the 3rd there are 3 "spaces". But thats all then. But i allready tried to make a table out of it in Numbers (thats the analogon to Excel on a Mac). I couldn't find out how to devide it into 3 columns yet.. any1 knows? Or maybe any1 knows that in Excel? I could use my Fathers PC for that then. hi Mariner. didn't see your post at first. I will check that ?readdata thx!

Say your data look like

Axel Vogt — Thu, 22 May 2008 21:48:20 Z

Say your data look like this (with non-constant spacing, but 3 for each line):

 1   15.0000   1.120000E+02
2   15.0003    1.460000E+02
3 15.0006 1.140000E+02
4 15.0008 1.340000E+02
5 15.0011 6.600000E+01
6 15.0014 1.100000E+02
7 15.0017 1.370000E+02
8 15.0019 6.000000E+01
9   15.0022          9.200000E+01
10 15.0025 5.200000E+01
53197 39.9963 9.000000E+01
53198 39.9971 9.900000E+01
53199 39.9978 3.000000E+01
53200 39.9985 4.900000E+01
53201 39.9993 1.330000E+02

and that they are stored in a file data.txt.

Then you write

  fd := fopen(dataFile,READ,TEXT):
  theData:=readdata(fd, 3): # 3 columns
  fclose(fd):

These are 15 tuples:

nData:=nops(theData);

                             nData := 15

Showing them you can use 'print(theData)' or convert(theData, listlist), working with them
may be best by using 'convert(theData, Array)'  or 'convert(%,Array, (datatype = float[8]))'

readdata example

Mariner — Thu, 22 May 2008 21:49:17 Z

Gernot,

Here's an example of using readdata to read in part of your text file, assuming that its Windows path is C:\Maths\Maths11 and its name is example.txt

restart;
readdata("C:\\Maths\\Maths 11\\example.txt",[integer,float,float]);
[[1, 15.0000, 112.0000], [2, 15.0003, 146.0000], [3, 15.0006, 114.0000],

   [4, 15.0008, 134.0000], [5, 15.0011, 66.00000], [6, 15.0014, 110.0000],

   [7, 15.0017, 137.0000], [8, 15.0019, 60.00000], [9, 15.0022, 92.00000],

   [10, 15.0025, 52.00000]]

Hope this helps

J. Tarr

Cannot make it work!

lemelinm — Thu, 22 May 2008 22:07:09 Z

Here is my *.txt file created in Excel

1    10,9    118,81
2    12    144
3    15    225
4    17,8    316,84
5    21,2    449,44
6    35,4    1253,16

The separator is the Tabulation. When I want to import it in Maple, here is what I get:

> readdata("D://Data//Data6//Data_plot1.txt", float, 3);

[[1., 10.], [2., 12., 144.], [3., 15., 225.], [4., 17.], [5., 21.], [6., 35.]]

As you can see, even if I tell Maple that they are floating numbers and that there is 3 columns, I get that strange result.

Any ideas?

mario.lemelin@cgocable.ca