Math.funData function

Mathematical operations for functional data objects

These functions allow to apply mathematical operations (such as c("$exp(),\n$", "$log(), sin(), cos()$") or $abs()$ to functional data objects based on Math. The operations are made pointwise for each observation.

## S4 method for signature 'funData'
Math(x)

## S4 method for signature 'multiFunData'
Math(x)

## S4 method for signature 'irregFunData'
Math(x)

Arguments

• x: An object of class funData, irregFunData or multiFunData.

Returns

An object of the same functional data class as x.

Examples

oldpar <- par(no.readonly = TRUE)
par(mfrow = c(1,2))

# simulate a funData object on 0..1 with 10 observations
argvals <- seq(0, 1, 0.01)
f <- simFunData(argvals = argvals, N = 10, 
                M = 5, eFunType = "Fourier", eValType = "linear")$simData

### FunData
plot(f, main = "Original data")
plot(abs(f), main = "Absolute values")

### Irregular
# create an irrgFunData object by sparsifying f
i <- as.irregFunData(sparsify(f, minObs = 5, maxObs = 10))

plot(i, main = "Sparse data")
plot(cumsum(i), main = "'cumsum' of sparse data")

### Multivariate
m <- multiFunData(f, -1*f)
plot(m, main = "Multivariate Data")
plot(exp(m), main = "Exponential")

par(oldpar)

See Also

funData, irregFunData, multiFunData, Math