J.Holfort, oceanographer

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Matlab Stuff

Some own matlab script and functions I found usable. (All are freely usable under the gnu public license). Most of these are only marginally described within the M-File itself (some in english, others in german and still other with a mix of both languages). Comments, bug reports or improvements please to user "holfort" at npolar.no or to user "juergen" at holfort.org.

Oceanography M-files

• SEABIRD reading and plotting program With HTML decription in english and deutsch
  Needs the seawater library (sw_?) from Phil Morgan.
  The M file sberead from this package can also be used as standalone to read binary and ascii CNV files (as for example from a 9-11 CTD or fram Seacats or Microcats). "SBschreib" can then be used to writes data back into the CNV format.
• Aanderaa reading program. Reads ascii and binary DSU data from Aanderaa RCM's and DCM's. There are three files: RCMlese.m is the main reading program, which calls aandread.m to read out the calibrations coefficents from a file called aandcalibrationsheet.txt. A short description (although still a mix of german and english) can be found in the files. Needs iles.m.
• mlrint, does a multiple linear regression to interpolate data.

More general purpose M-Files

• Time and date functions
  • zeitdecode.m decodes a date (and time) from a string and outputs the julian day. similar to datevec but handles some additional formats. Needs iles.m.
  • timeaxis.m put a date axis on the x or y axis. The numbers on that axis can be in days, minutes, seconds, etc. Needs dayjulian.m , julianday.m .
  • date_transform.m transfroms values from one dateformat (e.G. minutes since 23.5.1963) into another (e.G. years or days since 3-Nov-1512).
  • dayjulian.m gives the date (e.g. 23.2.2005) of a given julian day.
  • julianday.m converts a date into a julian day number.
• Geographical functions
  • posdecode: decodes geographical positions from a text string
  • lon_tr: transforms longitudes (or all 0-360degree data) so that values fit the actual plot window or are in -180to+180 respective 0-360 scale.
  • inlon: determines if input value is in between maximum and minimum longitude irespective of scale (-180-+180 or 0-360).
• lag_cor.m, makes one or several lagged correlations between two time series (which can have different lengths).
• plmeanx.m, calculates (and plots) a mean curve with standard deviations through given points.
• pfeil.m, draws interactivly an Arrow, which can be bend, etc.. (pfeil is german for arrow).
• iles.m reads integer values out of string. Needed for some M-files.