read the first line of a text file

[Cuong P. Nguyen]

i have a text file mydata.txt that looks like this :

 

C:\Users\Mike\03-26-2016\log.txt
23 4
46 6 2 4
98 9
22 0 3

 

all i need is to read the first line, and assign it to variable FILEPATH. what is an efficient way of doing that?

 

Thanks

Cuong

 

 

 

[Victor Zverovich]

If you quote the path

  "C:\Users\Mike\03-26-2016\log.txt"

  ...

then you will be able to use AMPL read command for this:

  param FILEPATH symbolic;

  read FILEPATH < mydata.txt;

  display FILEPATH;

Otherwise you'll probably need to use some general-purpose language to convert mydata.txt into the data format AMPL can understand. It is easy to call scripts written in other languages from AMPL using the shell command.

HTH,

Victor

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[hossein....@gmail.com]

What if we want to read the rest of numbers as a matrix?
 In other words we know number of rows but number of columns change per row.