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problem.parseformula

problem.parseformula

Purpose
Parse a formula written as an unparsed array of tokens into internal parsed (reverse Polish) format
Synopsis
ntoken = problem.parseformula (intype, invalue, type, value)
Arguments
intype 
Array of token types providing the unparsed formula.
invalue 
Array of values corresponding to the types in inType.
ntoken 
The number of tokens in the parsed formula (not counting the terminating xslp_op_eof token).
type 
Array of token types providing the parsed formula.
value 
Array of values corresponding to the types in type.
Example
Assuming that x and y are already defined as columns with index iX and iY respectively, the following example converts the formula "sin(x+y)" into internal parsed format, and then writes it out as a sequence of tokens. 
intype  = []
invalue = []

intype  = [xslp_op_ifun, xslp_op_lb, xslp_op_col, xslp_op_op,
           xslp_op_col, xslp_op_rb, xslp_op_eof]
invalue = [xslp_op_sin,  0,          iX         , xslp_op_plus,
           iY,          0,          0]

type  = []
value = []

ntoken = p.parseformula (intype, invalue, type, value)

i=0
while type[n] != xslp_op_eof:
  str = p.itemname (type[i], value[i])
  print (str)
  i += 1
Further information

For possible token types and values, see the chapter on "Formula Parsing" in the SLP reference manual.


Related topics
problem.parsecformula, problem.preparseformula

Parent Topic Reference Manual

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