index

Format:

index( scan_id, x_max [,int_expr start_index [, int_expr stop_index]])
index( scan_id, x_min [,int_expr start_index [, int_expr stop_index]])
index( scan_id, y_max [,int_expr start_index [, int_expr stop_index]])
index( scan_id, y_min [,int_expr start_index [, int_expr stop_index]])
index( scan_id, x_g*reater_than, float_expr value [, int_expr start_index [, int_expr stop_index]])
index( scan_id, x_l*less_than, float_expr value [, int_expr start_index [, int_expr stop_index]])
index( scan_id, y_g*reater_than, float_expr value [, int_expr start_index [, int_expr stop_index]])
index( scan_id, y_l*ess_than, float_expr value [, int_expr start_index [, int_expr stop_index]])

Result:

Number

Description:

Returns the index of a data point which has a certain feature. The start_index and stop_index define the search range. X_max etc. are keywords.

e.g.:

SPECTRA> * = index( bpu1, y_max)
27
display the index of the point with the highest y-value

SPECTRA> * = bpu1(index( bpu1, y_max),1)
1667.3192
displays the x-value of the point with the highest y-value

SPECTRA> * = index( bpu1, y_greater_than, 1)
19
the index of the first point with a y-value > 1