jmr@ecl.psu.edu (02/12/91)
Anyone out there know how to force the 48sx to return a symbolic derivative? What I want to do is take the derivative of an algebraic with respect to 'X' (for example), however, 'X' is defined in the current subdirectory with a numeric value. When I compute the derivative of some function f(X) with respect to 'X', rather than a symbolic result, the value of 'X' is substituted in "automatically". Unfortunately, this is not what I want. I need a symbolic derivative in term of the algebraic 'X'. The only work around I can figure is to use the "where" function (|) to substitute in some unused variable for 'X' and then compute the derivative. I must be overlooking something. Any ideas? Joe Reinhardt jmr@ecl.psu.edu
edp@jareth.enet.dec.com (Always mount a scratch monkey.) (02/13/91)
In article <1991Feb11.221409.644@ecl.psu.edu>, jmr@ecl.psu.edu writes... >Anyone out there know how to force the 48sx to return a symbolic derivative? >What I want to do is take the derivative of an algebraic with respect to >'X' (for example), however, 'X' is defined in the current subdirectory >with a numeric value. PATH -> p << HOME d p EVAL >>, where "d" is the derivative operator. You'll need to keep the troublesome variables out of your home directory for this to work. -- edp (Eric Postpischil) "Always mount a scratch monkey." edp@jareth.enet.dec.com