plslabelfunc - Assign a function to use for generating custom axis labels

label_func (PLLABEL_FUNC_callback(3plplot), input)
              This is the custom label function.  In order to reset to the default labelling, set this to  NULL.
              The  labelling  function  parameters  are, in order: .TP axis This indicates which axis a label is
              being requested for. The value will be one of PL_X_AXIS, PL_Y_AXIS or PL_Z_AXIS.

       value  This is the value along the axis which is being labelled.

       label_text
              The string representation of the label value.

       length The maximum length in characters allowed for label_text.

       label_data (PLPointer(3plplot), input)
              This parameter may be used to pass data to the label_func function.

       Many developers (who are credited at http://plplot.org/credits.php) have contributed to PLplot  over  its
       long history.

       This  function allows a user to provide their own function to provide axis label text.  The user function
       is given the numeric value for a point on an axis and returns a string  label  to  correspond  with  that
       value.   Custom  axis  labels  can  be  enabled  by  passing  appropriate  arguments  to  plenv(3plplot),
       plbox(3plplot), plbox3(3plplot) and similar functions.

       This function is used in example 19.

plslabelfunc - Assign a function to use for generating custom axis labels

       PLplot documentation at http://plplot.org/documentation.php.

                                                   July, 2025                              PLSLABELFUNC(3plplot)

plslabelfunc(label_func, label_data)