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ASCII data with 5000 columns


how to read an ASCII datafile with 5000 data coloumns.
The length of each line is about 56400 characters or longer.

reads, readf  don't work because the max stringlenth is exceeded.

The only way I know  to read is readu.
I separate the numbers in the byte array convert them to string and at
last to

It's a bit unbelievable that's idl is able to handle more than 2 Giga
Byte but
only if they are organized by lines and a few columns.

Any further ideas?