Nothing

```
################################################################################
# This file is part of growthrate. #
# #
# growthrate is free software: you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation, either version 3 of the License, or #
# (at your option) any later version. #
# #
# growthrate is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with growthrate. If not, see <http://www.gnu.org/licenses/>. #
################################################################################
diffquo <- function(data,tobs) {
n = length(tobs);
dtobs = diff(tobs);
data = as.matrix(data);
N = dim(data)[1];
n = dim(data)[2];
YI = matrix(nrow=N,ncol=(n-1));
diffdatak = rep(0,(n-1));
for (k in 1:N) {
YI[k,] = diff(data[k,])/dtobs;
}
Xtilda = matrix(nrow=n,ncol=N);
w = rep(0,n-2);
for (i in 2:(n-1)) {
w[i] = dtobs[i]/(dtobs[i-1]+dtobs[i]);
for (j in 1:N) {
Xtilda[i,j] = w[i]*YI[j,i-1]+(1-w[i])*YI[j,i];
}
}
for (j in 1:N) {
Xtilda[1,j] = YI[j,1];
Xtilda[n,j] = YI[j,n-1];
}
result = list(YI=YI,Xtilda=Xtilda);
return(result);
}
```

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