ROUTINES

This document provides basic information about a set of statistical routines designed to process data in EXTRA format. Files of this type may be used to store climate variability related data. For example, maps of sea level pressure may be stored as grids (vectors) in an EXTRA file. Such a file contains not only the graded values but also supplemental information for each map, like the level code, the grid's number of point etc.

            Thus, in an EXTRA format file each vector (record, map) of real values is preceded by four integer values.

These last values represent, in order:

      - the current record number;

      - the variable's code;

      - the variable's level;

      - the vector (record, map) length.

 

More information about the routines may be obtained by typing just the routine name, without parameters.

 

 

The list of routines

 

 Alphabetical order

 

  1. ADD The program adds the values in the two input files.
  2. ANMEAN The program calculates the annual means from monthly means.
  3. ANOMAL The program calculates anomalies from monthly data and long term means.
  4. ANORM The program normalizes the anomalies with the standard deviation.
  5. APPEND The program adds.
  6. AVG The program calculates the average field over all record in the input file.
  7. BOXAVG The program averages over areas of given dimensions.
  8. CADD The program adds a constant field to data.
  9. CANCOR The program performs canonical correlation.
  10. CDIV The program divides the input data with a constant field.
  11. CHANOSO The program revises a grid's lines order.
  12. CMULT The program multiplies the input data with a constant field.
  13. COARSE The program deletes every second row and column of a grid.
  14. COMPOZ The program calculates composite maps.
  15. COMPOZALL The program calculates composite maps and the positive and negative maps
  16. COMPOZCONT The program calculates continuous composite maps.
  17. COMPZLAG The program calculates composite maps with a specific lag.
  18. CORWINDOW The program performs window correlations.
  19. CROSSCOR The program calculates the cross-correlation function between two time series.
  20. CRSRHRT The program correlates a time series with a series of grids.
  21. CSUB The program multiplies the input data with a constant field.
  22. DECAMEAN The program calculates decadal means from monthly means
  23. DETREND The program fits and remove a linear trend.
  24. DFORM The program transforms an EXTRA file in a TEXT.
  25. EDGE The program replaces values in the input file.
  26. EXT1LTEXT2C The program transforms an EXTRA file with one record in a TEXT file with two columns.
  27. EXT2GAD The program transforms an EXTRA file to a GRADS file.
  28. FORMINV The program transforms a TEXT file in an EXTRA file.
  29. FOUFIL The program filters the data.
  30. GAD2EXT The program transforms a GRADS file to an EXTRA file.
  31. GGSTAT The program provides information about the file1's contents.
  32. LMEAN The program calculates long term means from monthly data.
  33. MERGEF The program merge two files, record by record.
  34. MKEOF The program performs EOF analysis.
  35. MULT The programs multiply two files, value by value.
  36. NRMSTDV The program calculates the standard deviation field and normalizes the input data in output file.
  37. PARTIAL-CORWINDOW The program performs window correlations.
  38. PROJECTION The program projects a vector on a series of vectors.
  39. REGRESIE The program correlates a time series with a series of grids.
  40. RUNNING MEANS The program calculates the running means.
  41. SADD The program adds a constant to a file.
  42. SDIV The program divides the data with a constant value
  43. SELBOX The program selects a rectangular area of a field.
  44. SELMON The program selects a month or season.
  45. SELVAR The program selects a variable and level.
  46. SMULT The program multiplies a field by a constant.
  47. SPLITF The program splits one file in two files.
  48. SSUB The program subtracts a constant value from a field.
  49. SUB The program subtracts two files (record by record).
  50. TEXT1CEXT1C The program transforms a TEXT file to an EXTRA file.
  51. TEXT2CEXT1C The program transforms a TEXT file to an EXTRA file.
  52. TP Transposition of a data matrix given in EXTRA format.