R scripts for data analysis of dataset related to phototropsim

hypocotyl_time_series.R performs data analysis and plotting of hypocotyl curvature time series. The scripts calculates the mean and standard error of the mean (sem) for each genotype and time point then plots the mean +/- sem agains time.

hypocotyl_time_series.R expects you to input a comma-separated values file with four columns:

• genotype : name of genotypes
• hypocotyl curvature : value of the absolute hypocotyl angle for a specific genotype and a specific time point. 180 denotes a vertical hypocotyl, 90 a horizontal hypocotyl. The direction is irrelevant in this column and must be specified in the direction column.
• time : a number representing the time in minutes spent under unidirectional blue light exposure.
• direction : a letter indicating the direction of hypocotyl bending. "n" (negative) denotes bending away from the light source while "p" (positive) denotes bending towards the light source.

For a concrete example of how the data should be formatted, see the file named hypocotyl_phototrop.csv in this repository. The data are organized according to the principles of "tidy data": each variable is a column and each observation is a row. For further explanations of this data format, see Hadley Wickham.Tidy data. The Journal of Statistical Software, vol. 59, 2014.