Conversions

• AXL: array $\leftrightarrow$ list conversion (transforms { } to [ ] and conversely).
• EPSX0: strip leading zeros in list-polynomials, replace objects by 0 if their absolute value is less than EPS.
• FXND: splits a fraction in numerator (stack 2) and denominator (stack 1). Ex:
  '(X+1)/A' FXND -> 2:X+1, 1:A
• NDXF: reverse of FXND. Ex:
  1 2 NDXF -> '1/2'
  Works for all data types (warning: you can get strange symbolics with NDXF).
• XNUM: convert level 1 to a numeric format like the build-in $\rightarrow$NUM, but accepts lists (this was not the case on S/SX models). Clears flags 12, 14 and 15.
• XQ: convert level 1 to rational format, like the build-in $\rightarrow$Q. Sets flags 12, 14 and 15.
• idn: like the built-in IDN but returns a symbolic identity matrix.
• SXL (other directory, obsolete): Used for conversion to internal data type representation)
  • VX variable-fraction representation conversion. Switches from algebraic to list-polynomials or fractions. Ex:
    '(X+1)/(3*X-2)' <--> '{1 1}/{3 -2}' (displayed as 'UNKNOWN/UNKNOWN')
    'X+3' <--> {1 3}
  • General stack object conversion. Ex:
    

    'X+3*SIN(X)'
    { { 1 '5*X' } { 'SIN(X)' 1 } }
    { 'X^2+7*X' '3*SIN(X)' }
    #3h  SXL ->
    { 'SIN(X)' X }
    { 3 { 1 0 } }
    { { 1 { { 5 0 } } } { { 1 0 } 0 } }
    { { { 1 7 0 } } { 3 0 } }
    

    To go back, type { #0 #1 #2 } SXL
• S2L (other directory, obsolete): convert an algebraic polynomial in a list polynomial. Ex:
  '1+2*A' A S2L -> { 2 1 } Accepts lists. Ex:
  { '1+A' '2*A-3' } A S2L -> { { 1 1 } { 2 -3} }
• L2S (other directory, obsolete): converts back a list polynomial to an algebraic. L2S may be used for multiple variable polynomial evaluation. Ex:
  { { 1 2 3} {4 5 6} } { X Y } L2S -> '(Y^2+2*Y+3)*X+(4*Y^2+5*Y+6)'