View source: R/bloodPerfusionSVD.R
trapz | R Documentation |
Given a vector (or a matrix) representing a curve (or set of curves, columnwise), the area (or set of areas) is calculated using the trapezoidal rule.
trapz(x, y)
x |
vector of samples for the dependent variable. |
y |
vector or matrix of samples for the independent variable. In the case of the latter, curves are organized column-wise. |
area (areas) under the sampled curve (curves).
Tustison NJ
x <- seq(0, 1, by = 0.0001)
y <- exp(x)
# Compare with true area of exp( 1 ) - 1 = 1.718282...
areaEstimate <- trapz(x, y)
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