SAFD (version 0.02)

checking: Checking correct data format

Description

The function checks if the input data is of the correct form of a polygonal fuzzy number, i.e. a dataframe with the columns "x" and "alpha" fulfilling the following conditions: (1) alpha-values have to be in [0,1] with the minimum alpha-level being 0 and maximum being 1, (2) the x-values have to be non-decreasing, (3) the alpha-levels have to increase from 0 to 1 and afterwards decrease from 1 to 0 in the same way (i.e. the alpha-column consists of an increasing vector from 0 to 1 plus the same vector in decreasing order). As a consequence the dataframe always has an even number of rows, see examples. The function is used internally in almost all the other functions to do a preliminary checking if the input data is of the correct form.

Usage

checking(X, com = 1)

Arguments

X

...can be any data frame.

com

...numeric, if com=1 then, in case of an error, a comment is printed. By default com=1.

Value

• The function returns the value 1 if the input fulfills all conditions, if not, 0 is returned.

Details

See examples

See Also

See Also as checking2, translator

Examples

data(XX)
checking(XX[[1]],1)
#
X<-data.frame(cbind(y=c(-2,-0.75,-0.25,0.5,1),alpha=c(0,0.6,0.9,0.9,0)))
checking(X)
#
X<-data.frame(cbind(x=c(-2,-0.75,-0.25,0.5,1),alpha=c(0,0.6,0.9,0.9,0)))
checking(X)
#
X<-data.frame(cbind(x=c(-2,-0.75,-0.25,-0.5,1),alpha=c(0,0.6,1,1,0)))
checking(X)
#
X<-data.frame(cbind(x=c(-2,-0.75,-0.25,0.5,1),alpha=c(0.3,0,1,0,0.3)))
checking(X)
#
Y<-data.frame(cbind(x=c(-2,-0.75,-0.25,0.5,1),alpha=c(0,0.3,1,0,0.3)))
checking(Y)
#
Z<-data.frame(cbind(x=c(-2,-0.75,-0.25,0.5,1),alpha=c(0,0.6,1,1,0)))
checking(Z)
#
U<-data.frame(cbind(x=c(-1,0,1),alpha=c(0,1,0)))
a<-checking(U,)