Obsolete IDL Features: Routines with Obsolete Arguments or Keywords

LM_FIT

The following keyword to the LM_FIT function is obsolete.

Keywords

WEIGHTS

This keyword has been replaced by the MEASURE_ERRORS keyword. Code that uses the WEIGHTS keyword will continue to work as before, but new code should use the MEASURE_ERRORS keyword. Note that the definition of the MEASURE_ERRORS keyword is not the same as the WEIGHTS keyword. Using the WEIGHTS keyword, SQRT(1/WEIGHTS[i]) represents the measurement error for each point Y[i]. Using the MEASURE_ERRORS keyword, the measurement error for each point is represented as simply MEASURE_ERRORS[i].

  IDL Online Help (March 06, 2007)