Geographic Information Systems Asked by Olha Marinich on July 26, 2021
One of my virtual field contains too big numbers like "5994865699857.456". I need to show those values in scientific/exponential mode like 5.99E+12. I didn’t find proper function in Field Calculator. I searched for solution among others questions but all questions address inverse problem – converting scientific view to number one, and I didn’t find a solution among answers.
Is there some trick in Field Calculator to solve the problem?
Edit: I’d like to see value in scientific notation in Feature Attributes form when I use "Identify Features" function.
Edit2: I also tried to create custom function:
from qgis.core import *
from qgis.gui import *
@qgsfunction(args='auto', group='Custom')
def fd_sci(value1, feature, parent):
vtostring = str(value1)
a = "{:.2e}".format(vtostring)
return a
Then created a new virtual field using expression:
fd_sci("virtual_field_with_big_number")
But the result is NULL
Eventually I found what works. Just no need to convert a value to string, and Output field type should be Decimal number (real):
from qgis.core import *
from qgis.gui import *
@qgsfunction(args='auto', group='Custom')
def fd_sci(value1, feature, parent):
a = "{:.2e}".format(value1)
return a
Answered by Olha Marinich on July 26, 2021
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