Friedmann Test with Wilcoxon signed rank test:
friedman.test(y, ...)
y
either a numeric vector of data values, or a data matrix.

groups,a vector giving the group for the corresponding elements of y if this is a vector; ignored if y is a matrix. If not a factor object, it is coerced to one.

blocks	
a vector giving the block for the corresponding elements of y if this is a vector; ignored if y is a matrix. If not a factor object, it is coerced to one.

formula	
a formula of the form a ~ b | c, where a, b and c give the data values and corresponding groups and blocks, respectively.

wilcox.test(x, y, paired=TRUE)
x	
numeric vector of data values. 
y	
an optional numeric vector of data values