symSEM (version 0.1)

sym: Convert a Character Expression to Ryacas Symbol or matrix

Description

It converts a Character Expression or Matrix in R to Ryacas symbolic expression or matrix.

Usage

sym(x)

Value

An expression or matrix of class "yac_symbol".

Arguments

x

A character expression or matrix.

Author

Mike W.-L. Cheung <[e-mail]>

Details

It converts mathematic operators from R to mathematic operators in yacas and then uses ysym to convert the R character expression or matrix to Ryacas symbolic expression or matrix. The Ryacas expression or matrix can be used for further symbolic calculations.

See Also

ysym, as.matrix

Examples

A1 <- "log(x) + exp(y)"

sym(A1)
# y: Ln(x)+Exp(y)

A2 <- matrix(c(1, 2, 3, "a", "sqrt(b)", "sin(c)"), ncol=2, nrow=3)
A2
#     [,1] [,2]     
# [1,] "1"  "a"      
# [2,] "2"  "sqrt(b)"
# [3,] "3"  "sin(c)" 

sym(A2)
# {{      1,       a},
#  {      2, Sqrt(b)},
#  {      3,  Sin(c)}}