In QGIS, if you want to calculate the real geometries (such as area, parameter, length etc.) of polygon/point based on the current coordinate system, we need using the field calculator. If we use this calculator, we able to show the geometries in the features table. I list a few field calculators that may interest the QGIS user as follows:
latitude and longitude
$x or $y as a variable to get the x and y
Here a question (original link) that I ask at Matlab Community that the reader may found useful.
Question:
I have a large string that containing time period such as 23-May-2009 02:00:00 (as attached). Variable editor in Matlab is unable to display these variables, since the variables have more that 524288 elements. I want to export the variables to .dat file, so I can see the list of the variables. I try to use fopen and fprintf functions to export the variables, but unsuccessful. Any help? Thank you.
Answer:
load hourlyperiod.mat
d = hourlyperiod ;
fid = fopen('iwant.dat','w') ;
for i = 1:length(d)
fprintf(fid,'%s \n',d(i,:)) ;
end
fclose(fid) ;