How to use expression with multiple files
Added by Purna Durga Geesupalli about 2 years ago
Dear CDO Support,
I am trying to add an expression BC*rho*10^9 from different .nc files.
First I have to sum all BC modes like BC=BC_KS+BC_AS+BC_CS+BC_KI /mnt/nas/DATA/anwesa/Baseline_NoForcing/output/baseline_200406.01_tracer.nc
after I have to multiply the above BC with rhoam1 from /mnt/nas/DATA/anwesa/Baseline_NoForcing/output/baseline_200406.01_vphysc.nc
At last i need to do BC*rhoam1*1000000000
For each netcdf file I wanna convert hybrid coordinates into pressure coordinates.
Thus, I have written
#!/bin/bash
export RELPATH=/mnt/nas/DATA/anwesa/Baseline_NoForcing/output
cdo -f nc -expr,'BC=BC_KS+BC_AS+BC_CS+BC_KI*rhoam1*1000000000' -ml2pl,100000,97500,95000,92500,90000,87500,85000,82500,80000,77500,75000,70000,65000,60000,55000,50000,45000,40000,35000,30000,25000,22500,20000,17500,15000,12500,10000 -selname,BC_KS,BC_AS,BC_CS,BC_KI "${RELPATH}"/baseline_200406.01_tracer.nc -ml2pl,100000,97500,95000,92500,90000,87500,85000,82500,80000,77500,75000,70000,65000,60000,55000,50000,45000,40000,35000,30000,25000,22500,20000,17500,15000,12500,10000 -selname,rhoam1 "${RELPATH}"/baseline_200406.01_vphysc.nc test.nc
But, I am facing the error like this.
cdo (Abort): Unprocessed Input, could not process all Operators/Files
Replies (3)
RE: How to use expression with multiple files - Added by Estanislao Gavilan about 2 years ago
Hi Purna,
You need to think that cdo works from right to left. Now if you want to interpolate the data before evaluating the expression you need to move the -ml2pl before the first expression (BC=blabla).
cdo -f nc -ml2pl,100000,97500,95000,92500,90000,87500,85000,82500,80000,77500,75000,70000,65000,60000,55000,50000,45000,40000,35000,30000,25000,22500,20000,17500,15000,12500,10000 -expr,'Total =BC*rhoam1*1e+9' -selname,rhoam1 "${RELPATH}"/baseline_200406.01_vphysc.nc -expr,'BC=BC_KS+BC_AS+BC_CS+BC_KI' -selname,BC_KS,BC_AS,BC_CS,BC_KI baseline_200406.01_tracer.nc test.ncPD: I am not sure if this can work. You might need to do further work
Kind regards,
Estanislao
RE: How to use expression with multiple files - Added by Purna Durga Geesupalli about 2 years ago
Dear Estanislao,
Thank you for the reply. I have got an output my doing this. Hope you can also try..
#!/bin/bash
export RELPATH=input data path
export OUTPATH=output data path
export vars="BC_KS,BC_AS,BC_CS,BC_KI,aps"
export fun="BC_KS+BC_AS+BC_CS+BC_KI"
cdo -expr,Total=${fun}*rhoam1*1e+9 -ml2pl,100000,97500,95000,92500,90000,87500,85000,82500,80000,77500,75000,70000,65000,60000,55000,50000,45000,40000,35000,30000,25000,22500,20000,17500,15000,12500,10000 -merge -sp2gp "${RELPATH}"/baseline_200406.01_tracer.nc -sp2gp "${RELPATH}"/baseline_200406.01_vphysc.nc "${OUTPATH}"/test.nc
Regards,
Purna
RE: How to use expression with multiple files - Added by Estanislao Gavilan about 2 years ago
Hi Purna,
I am happy to hear that it seems working. You can also break each step into difference operations to make sure everything is working as it should be.
Kind regards,
Estanislao