# r.mapcalc: collection of values

 Classic List Threaded
2 messages
Reply | Threaded
Open this post in threaded view
|

## r.mapcalc: collection of values

 Hi, I am trying to create a map combining two maps. Each category in the final map will depend on the value in the other two.  I will do it using nested "if". I have already done this kind of "if": aed06_p_3= if(a06_p_2 == 243, if(arb_p >= 20, 10, if(arb_p < 10, 20, 33)), if(a06_p_2 == 244, if(arb_p >= 20, 10, if(arb_p < 10, 31, 33)), if(a06_p_2 == 324, if(arb_p >= 20, 10, if(arb_p < 10, 32, 33)), a06_p_2))) But now, instead of one value for a06_p_2 I will have various possible values (more than 5), so the nested if is geeting too long. I would like to know if there is an option shorter than writting a collection of "OR": a06_p_2==243 | a06_p_2==234 | a06_p_2==245 | a06_p_2==246 a way to collect all the values, maybe something similar to a06_p_2 IN (243,244,245,246) Thanks a lot
Reply | Threaded
Open this post in threaded view
|

## Re: r.mapcalc: collection of values

 bei wrote: > I am trying to create a map combining two maps. Each category in the final > map will depend on the value in the other two.  I will do it using nested > "if". I have already done this kind of "if": > aed06_p_3= if(a06_p_2 == 243, if(arb_p >= 20, 10, if(arb_p < 10, 20, > 33)), if(a06_p_2 == 244, if(arb_p >= 20, 10, if(arb_p < 10, > 31, 33)), if(a06_p_2 == 324, if(arb_p >= 20, 10, if(arb_p < > 10, 32, 33)), a06_p_2))) > > But now, instead of one value for a06_p_2 I will have various possible > values (more than 5), so the nested if is geeting too long. > > I would like to know if there is an option shorter than writting a > collection of "OR": a06_p_2==243 | a06_p_2==234 | a06_p_2==245 | > a06_p_2==246 > > a way to collect all the values, maybe something similar to a06_p_2 IN > (243,244,245,246) There isn't an "in" operator. Also, from your description, you might be better off using r.cross and r.reclass. -- Glynn Clements <[hidden email]> _______________________________________________ grass-user mailing list [hidden email] http://lists.osgeo.org/mailman/listinfo/grass-user