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, BOXZOOM = boxzoom, 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, BOXZOOM = boxzoom, TIME_1 = time_1, TIME_2 = time_2, ALL_DATA = all_data) |
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33 | var_b = nc_read(file_name, b, ncdf_db, BOXZOOM = boxzoom, TIME_1 = time_1, TIME_2 = time_2, ALL_DATA = all_data) |
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34 | var_c = nc_read(file_name, c, ncdf_db, BOXZOOM = boxzoom, TIME_1 = time_1, TIME_2 = time_2, ALL_DATA = all_data) |
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35 | var_d = nc_read(file_name, d, ncdf_db, BOXZOOM = boxzoom, TIME_1 = time_1, TIME_2 = time_2, ALL_DATA = all_data) |
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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:''} |
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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 | field.direc = var_a.direc |
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80 | |
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81 | return, field |
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82 | |
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83 | END |
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