Hi
I cannot think of a short and simple SQL "one liner" statement but can
think of a short script that will do that using SQL statements.
In pseudo-code, translate to your favorite language:
# get the unique classes
SELECT distinct(label) FROM table;
-> fetch results in an array "txt_label"
# iterate over array and insert new integer labels in table
int_label = 0
foreach txt_label {
INSERT INTO table.label_int VALUES int_label WHERE label = 'txt_label'
n++
}
This may seem obvious to you, but since you asked :-)
Cheers and good luck
Hernán
On 2019-12-04 18:11, Markus Neteler wrote:
Hi,
I have a landuse map with text labels (forest, street, ...). For
r.learn.ml I need to have them as numeric classes.
It is not important for me which number is assigned but I search for
an automated solution, i.e. SQL statement unless there is a different
way.
So:
cat|label|label_int
1|forest|1
2|forest|1
3|street|2
4|forest|1
5|street|2
6|urban|3
...
I guess I have done that already some years ago but I can't remember
the trick :-)
thanks for a hint,
Markus
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