integrate a function in r (wrong length) -


i facing problem “integrate” command in r , don’t know how solve it, how deal extremely appreciated!

i have data have fitted function using nls command. integrate function on range (e.g. 2-20), in case illustrates fluorescence 2-20 meters in water column – in function.

the way tried it:

depth <- seq(0,100, by=.1)   #### first making vector simulates depth (have real once in own data set).  flu <- 0.216 + 0.140*depth + (-0.01538*(depth^2)) + 0.0004134*(depth^3)   ### fitted function.  integrand <- function(depth) {flu}  integrate(integrand, lower= 2, upper= 20)

when this, r says: error in integrate(integrand, lower = 2, upper = 20) : evaluation of function gave result of wrong length

i have tried vectorize flu function , integrate again, doesn’t help. maybe floating points? don’t know how deal this.

hope can me - time , in advance!!! søren

 depth <- seq(0,100, by=.1)    flu <- function(depth) {0.216 + 0.140*depth + (-0.01538*(depth^2)) + 0.0004134*(depth^3) }  integrate(flu, lower= 2, upper= 20) #7.170026 absolute error < 8e-14

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