For C, the values for these parameters can be set by using the procedures c_ftseti, c_ftsetr, c_ftsetc, and c_ftsetfa. For NCL programs, the parameters can be set using the NCL procedure ftsetp.
| | | | Parameter | parameter | | | name | type | description | legal values | default value | | | | ------------------------------------------------------------------------------ eps | float | smoothing parameter | 0. <= eps and | none | | for ftcurvs and | 1. >= eps | | | ftcurvps | | ------------------------------------------------------------------------------ sig | float | the value of the | >= 0. | 1. | | tension factor | | ------------------------------------------------------------------------------ sl1 | float | the slope of the | any float | 0. | | curve at the first | | | | point (see parameter| | | | sf1). | | ------------------------------------------------------------------------------ sln | float | the slope of the | any float | 0. | | curve at the final | | | | point (see parameter| | | | sf1). | | ------------------------------------------------------------------------------ sf1 | int | controls the use of | 0=use both | 3 | | parameters sl1 and | 1=use sl1 only| | | sl2 | 2=use sl2 only| | | | 3=use neither | ------------------------------------------------------------------------------ sf2 | int | controls the use of | 0=use neither | 3 | | parameters smt and | 1=use both | | | eps | 2=use smt only| | | | 3=use eps only| ------------------------------------------------------------------------------ smt | float | smoothing parameter | > 0. | none | | for ftcurvs and | | | | ftcurvps | | ------------------------------------------------------------------------------ zx1 | float array| X partials at left | any floats | none | | for ftsurf | | ------------------------------------------------------------------------------ zxm | float array| X partials at right | any floats | none | | for ftsurf | | ------------------------------------------------------------------------------ zy1 | float array| Y partials at bottom| any floats | none | | for ftsurf | | ------------------------------------------------------------------------------ zyn | float array| Y partials at top | any floats | none | | for ftsurf | | ------------------------------------------------------------------------------ z11 | float | X-Y partial at lower| any float | none | | left for ftsurf | | ------------------------------------------------------------------------------ zm1 | float | X-Y partial at lower| any float | none | | right for ftsurf | | ------------------------------------------------------------------------------ z1n | float | X-Y partial at upper| any float | none | | left for ftsurf | | ------------------------------------------------------------------------------ zmn | float | X-Y partial at upper| any float | none | | right for ftsurf | | ------------------------------------------------------------------------------ df1 | int | flag indicating if | 0 = yes | 1 | | zx1 is user supplied| 1 = no | ------------------------------------------------------------------------------ df2 | int | flag indicating if | 0 = yes | 1 | | zxm is user supplied| 1 = no | ------------------------------------------------------------------------------ df3 | int | flag indicating if | 0 = yes | 1 | | zy1 is user supplied| 1 = no | ------------------------------------------------------------------------------ df4 | int | flag indicating if | 0 = yes | 1 | | zyn is user supplied| 1 = no | ------------------------------------------------------------------------------ df5 | int | flag indicating if | 0 = yes | 1 | | z11 is user supplied| 1 = no | ------------------------------------------------------------------------------ df6 | int | flag indicating if | 0 = yes | 1 | | zm1 is user supplied| 1 = no | ------------------------------------------------------------------------------ df7 | int | flag indicating if | 0 = yes | 1 | | z1n is user supplied| 1 = no | ------------------------------------------------------------------------------ df8 | int | flag indicating if | 0 = yes | 1 | | zmn is user supplied| 1 = no | ------------------------------------------------------------------------------