Description Usage Arguments Value Note Author(s) Examples

The purpose of this function is supporting the functions of this package (by introducing some nested "if-else" conditions) from all possible messages which are defined in functions of this package. The "messages" function is used in most of functions of this package.

1 | ```
messages(M)
``` |

`M` |
A L, LR or RL fuzzy number |

Some special messages like: "NOT additive", "NOT productive", .... If any message is not necessary for this function, then the value 1 will be return by this function which is used in the text and the body of other functions.

This function has not any applications for users of package and it considered only for shortening the length of programming.

Abbas Parchami

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 | ```
messages("NOT additive")
messages( LR(3,1,1) )
## The function is currently defined as
function (M)
{
options(warn = -1)
if (M[1] == "Addition has NOT a closed form of a LR fuzzy number") {
return(noquote(paste0("Addition has NOT a closed form of a LR fuzzy number")))
}
else if (M[1] == "Subtraction has NOT a closed form of a LR fuzzy number") {
return(noquote(paste0("Subtraction has NOT a closed form of a LR fuzzy number")))
}
else if (M[1] == "Production has NOT a closed form of a LR fuzzy number") {
return(noquote(paste0("Production has NOT a closed form of a LR fuzzy number")))
}
else if (M[1] == "Division has NOT a closed form of a LR fuzzy number") {
return(noquote(paste0("Division has NOT a closed form of a LR fuzzy number")))
}
else if (M[1] == " The fourth element of each LR fuzzy number must be 0 or 0.5 or 1! ") {
return(noquote(paste0(" The fourth element of each LR fuzzy number must be 0 or 0.5 or 1! ")))
}
else if (M[1] == " The scalar multiplication is not defined for zero ") {
return(noquote(paste0(" The scalar multiplication is not defined for zero ")))
}
else if (M[1] ==
"A regular approxi. is not defined for multiplication since at least one of FNs is non + and non -"
) {
return(noquote(paste0(
"A regular approxi. is not defined for multiplication since at least one of FNs is non + and non -"
)))
}
else if (M[1] ==
"A regular approximation is not defined for division since at least one of LR FNs is not positive"
) {
return(noquote(paste0(
"A regular approximation is not defined for division since at least one of LR FNs is not positive"
)))
}
else {
return(1)
}
}
``` |

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