On 10/22/2013 2:56 PM, Norbert Marwan wrote: > dpb <firstname.lastname@example.org> wrote in message <email@example.com>... ...
>> Actually, I don't see why the regexp() folderol...with fixed-width >> fields simplest and quickest would be to simply insert the comma in >> the appropriate columns w/ strrep() or similar direct manipulation. >> Looks like complexity for the sake of showing cleverness??? >> ...
> because it is much slower for long data files with ten-thousends of > lines. the from the support suggested solution is much faster, but not > as fast as textread can be.
You're saying the above regexp() solution is faster than
[s(:,4) char(ones(3,1)*',') ... ]
where the comma column is predefined? That's surprising.
> i wonder why the '(....)(..)(..)(...)(...)' is not applicable to > textread or textscan. this would also help. but noooo, this would be too > simple.
Because it isn't at all related to C i/o format scanning; regular expressions are their own thing independent thereof. That part I do understand fully; it would be, imo, _a_bad_thing_ (tm) to try to fold them together adding generally unwanted complexity to the most mundane as a cost.
The answer is that there really should be another class of i/o functions that _are_ based on the FORMAT scanning instead of C-like fscanf() and friends.
That one, unfortunately, just doesn't look like it's ever going to happen outside the File Exchange, perhaps, by someone younger (or at least more energetic) than I am any longer...