Nothing
imf = function( mass, expon, mass_range) {
ncomp = length(expon)
if(length( mass_range)!=ncomp + 1 )
stop(paste('mass range vector must have ',ncomp+1, ' components' ))
if(any(mass_range<=0))
stop('mass range vector must be positive definite')
npts = length(mass)
if(missing(mass)){
stop('mass vector (first parameter) has not been defined')
}
integ = numeric(ncomp)
for(i in 1:ncomp) {
if(( expon[i]!=-1 ) )
integ[i] =
(mass_range[i+1]^(1+expon[i]) - mass_range[i]^(1+expon[i]))/(1+expon[i])
else
integ[i] = log(mass_range[i+1]/mass_range[i])
}
joint = numeric(ncomp)
joint[1] = 1
if(ncomp>1 )
for(i in 2:ncomp) {
joint[i] = joint[i-1]*mass_range[i]^( expon[i-1] - expon[i] )
}
norm = numeric(ncomp)
norm[1] = 1./ sum(integ*joint)
if(ncomp>1 )
for(i in 2:ncomp) norm[i] = norm[1]*joint[i]
print(norm)
f = mass*0.
for(i in 1:ncomp) {
test =(mass>mass_range[i]) & (mass<=mass_range[i+1])
print(test)
print(norm[i])
print(mass[test])
print(expon[i])
f[test] = norm[i]*mass[test]^(expon[i])
}
return(f)
}
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