| 1 | ; |
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| 2 | ; compute ratio between 2 or 4 variables [ a/b or (a-b)/(c-d) ] |
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| 3 | |
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| 4 | FUNCTION make_ratio, file_name, ncdf_db, TIME_1 = time_1, TIME_2 = time_2, ALL_DATA = all_data, ZMTYP = zmtyp |
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| 5 | |
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| 6 | @common |
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| 7 | @com_eg |
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| 8 | |
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| 9 | ; Extracts the variables between the commas. |
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| 10 | ; Pay attention : the order is important (a,b,c,d) |
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| 11 | |
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| 12 | div = 0.0 |
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| 13 | |
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| 14 | tab_var = strsplit(macro_base_fld, ',', /EXTRACT) |
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| 15 | IF ( debug_w ) THEN print, 'size(tab_var) : ', size(tab_var) |
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| 16 | |
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| 17 | IF ( (size(tab_var))[1] NE 2 AND (size(tab_var))[1] NE 4 ) THEN BEGIN |
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| 18 | print, 'Number of variables in the macro should be 2 or 4' |
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| 19 | ENDIF |
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| 20 | |
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| 21 | IF ( (size(tab_var))[1] EQ 4 ) THEN BEGIN |
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| 22 | a = strtrim(tab_var(0), 2) |
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| 23 | b = strtrim(tab_var(1), 2) |
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| 24 | c = strtrim(tab_var(2), 2) |
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| 25 | d = strtrim(tab_var(3), 2) |
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| 26 | |
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| 27 | print, 'a : ', a |
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| 28 | print, 'b : ', b |
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| 29 | print, 'c : ', c |
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| 30 | print, 'd : ', d |
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| 31 | |
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| 32 | var_a = nc_read(file_name, a, ncdf_db, TIME_1 = time_1, TIME_2 = time_2) |
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| 33 | var_b = nc_read(file_name, b, ncdf_db, TIME_1 = time_1, TIME_2 = time_2) |
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| 34 | var_c = nc_read(file_name, c, ncdf_db, TIME_1 = time_1, TIME_2 = time_2) |
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| 35 | var_d = nc_read(file_name, d, ncdf_db, TIME_1 = time_1, TIME_2 = time_2) |
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| 36 | |
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| 37 | div = var_a.data |
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| 38 | ;;div[*, *] = valmask |
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| 39 | div[*, *] = -1000.0 |
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| 40 | diff = var_c.data - var_d.data |
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| 41 | |
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| 42 | idx = WHERE( diff NE 0.0 ) |
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| 43 | IF( idx[0] EQ -1 ) THEN STOP, 'STOP. Division cannot be computed' |
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| 44 | |
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| 45 | div(idx) = ( var_a.data(idx) - var_b.data(idx) )/( diff(idx) ) |
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| 46 | legend = ' : ( '+a+' - '+b+' ) / ( '+c+' - '+d+' )' |
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| 47 | |
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| 48 | ENDIF |
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| 49 | |
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| 50 | IF ( (size(tab_var))[1] EQ 2 ) THEN BEGIN |
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| 51 | |
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| 52 | a = strtrim(tab_var(0), 2) |
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| 53 | b = strtrim(tab_var(1), 2) |
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| 54 | |
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| 55 | print, 'a : ', a |
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| 56 | print, 'b : ', b |
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| 57 | |
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| 58 | var_a = nc_read(file_name, a, ncdf_db, TIME_1 = time_1, TIME_2 = time_2) |
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| 59 | var_b = nc_read(file_name, b, ncdf_db, TIME_1 = time_1, TIME_2 = time_2) |
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| 60 | |
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| 61 | div = var_a.data |
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| 62 | div[*, *] = valmask |
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| 63 | |
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| 64 | idx = WHERE( var_b.data NE 0.0 ) |
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| 65 | IF( idx[0] EQ -1 ) THEN STOP, 'STOP. Division cannot be computed' |
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| 66 | |
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| 67 | div(idx) = ( var_a.data(idx) )/( var_b.data(idx) ) |
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| 68 | legend = ' : '+a+' / '+b |
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| 69 | |
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| 70 | ENDIF |
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| 71 | |
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| 72 | varname = 'ratio' |
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| 73 | varunit = '' |
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| 74 | |
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| 75 | field = {name: '', data: div, legend: '', units: '', origin: '', dim: 0, direc:'xy'} |
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| 76 | field.origin = var_a.origin |
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| 77 | field.dim = var_a.dim |
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| 78 | field.legend = legend |
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| 79 | |
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| 80 | return, field |
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| 81 | |
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| 82 | END |
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