The frequencies data consist of ND+1 records, the first one is composed by a single field and the other ones are composed by NS fields, where ND is the number of directions in the wind rose (4, 8 or 16 are selected in the Options) and NS is the number of speed classes (as selected in the Options). The first record contains the number of calms (put 0 if you have no calms), while the other ones contain the number of events in each directions. The first direction is always North, and the others follow clockwise.
Please be aware that:
1) you must first set the Options, then load the frequencies data according to the values of ND and NS specified in the Options;
2) the numbers are integers indicating the number of events, not percentages.
Frequencies input file must have the extension .FRQ.
An example of frequencies data for 16 directions and 4 wind speed classes is shown below.
1036
1565,2097,627,93
2263,1247,136,8
1803,171,0,0
1433,60,0,0
3152,317,8,0
601,69,0,0
429,26,0,0
567,51,0,0
883,120,0,0
1421,206,9,0
3626,651,34,0
2620,1061,68,0
1566,726,77,0
385,128,8,0
650,349,50,8
898,662,169,93
An example of FRQ input file is contained under the directory Sample of the installation path, and is called sample.frq.