[Maxima] Read_array Question
robert.dodier at gmail.com
Sat Jan 7 15:35:16 CST 2012
On 12/31/11, Thomas D. Dean <tomdean at speakeasy.org> wrote:
> The data is
> Qth 23 41 a+bx
> Z9 3 7 41
> <name> number number <maxima expression>
> I want to read this file into maxima.
Well, there are a couple of functions to read data from a file
when the number of rows isn't known ahead of time.
read_matrix reads all the lines and creates a matrix with that many rows.
read_hashed_array reads the first item on each line and uses
that as a hash key for the remaining items on the line.
It returns an "undeclared array" (Maxima terminology for
a hash table).
But a problem is that the various read_* functions treat
each token as a separate item. E.g. a + b is read as two
items, a and +b. If your data contain some general expressions,
you will probably have to read line by line and play some games
with the parser.
Sorry for the late reply, hope this helps.
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