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Hi Cevahir, The problem is that you are allocating the array u10 in a way that makes its values non-contiguous in memory: > float ***const u10 = new float** [NT]; > for(int i = 0; i < NT; ++i) { > u10[i] = new float* [NY]; > } > for(int i = 0; i < NT; ++i) { > for(int j = 0; j < NY; ++j) { > u10[i][j] = new float [NX]; > } > } Addresses of arrays provided as arguments to netCDF functions must point to contiguous values in memory. There must not be gaps between successive values of the arrays. Such gaps are almost assured if you use "new" to allocate each row of a three dimensional array separately. For the invocation of the "put" method in > NcVar *idU10 = dataFile.add_var("U10", ncFloat, dimT, dimY, dimX); > idU10->put(&u10[0][0][0], NT, NY, NX); the address &u10[0][0][0] must point to a single block of floats. Your program should work as intended if you allocate all the values at once. --Russ Russ Rew UCAR Unidata Program address@hidden http://www.unidata.ucar.edu Ticket Details =================== Ticket ID: XUI-152530 Department: Support netCDF Priority: Urgent Status: Closed