[GRASS-dev] How to: if undefined, set to NULL?
Nikos Alexandris
nik at nikosalexandris.net
Sun Sep 4 06:45:50 PDT 2016
Nikos Alexandris:
>>> if (chroma == 0.0) {
>>>
>>> saturation = 0.0;
>>>
>>> /* undefined -- (how to) set to NULL? */
>>> hue = 0.0;
>>> I'd like to set hue to NULL, whenever the condition is met. How do I do
>>> that?
Markus Neteler:
>>Something like:
>>
>> for (row = 0; row < nrows; row++) {
>> G_percent(row, nrows, 5);
>> for (col = 0; col < ncols; col++) {
>> cell_buf[col] = bas[SEG_INDEX(ba_seg, row, col)];
>> if (cell_buf[col] == 0)
>
>> Rast_set_null_value(&cell_buf[col], 1, CELL_TYPE);
>
>Alright, that is: anything that `&cell_buf[col]` points to, set the
>number of values `1` to NULL.
Updated in sandbox, see: https://trac.osgeo.org/grass/changeset/69365
Is it though correct?
Nikos
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