[GRASS-user] pyhton script-how to get the pixel value from r.what

[tigrida]

Hello!

I am writing a python script, and I want to do mathematical operations with
some pixels, but I can't. Can anyone help me?


script:
ts_f= grass.read_command("r.what",input=Ts, east_north= "%s,%s" %
(eastF,northF))
print "Ts pixel frio=",ts_f
lambda_f=(2.501-(0.00236*(ts_f-273.15)))*1000000

error:
Ts pixel frio= 180740.539419|2399806.55602||290.266289112492

Traceback (most recent call last):
  File "vslp2.py", line 284, in <module>
    lambda_f=(2.501-(0.00236*(ts_f-273.15)))*1000000
TypeError: unsupported operand type(s) for -: 'str' and 'float'


I really appreciate any suggestions



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