Kuo-Hsien Chang questions

• warning: format ‘%d’ expects type ‘int’, but argument 4 has type ‘size_t’
• R: calculate average over a specific time window in a time series data frame
• how to sort out intent(in), intent(out) and intent(inout) in FORTRAN
• Matlab: mean value in 4-d matrix
• R: as.POSIXct timezone and scale_x_datetime issues in my dataset

Kuo-Hsien Chang answers