Boxplot with time on x axis

Does anybody know how to obtain a boxplot with time on the x axis?

I have collected experimental observations at irregular intervals over a period of time and would like my boxplot to have a linear time axis, however, the boxplot displays my results as 12 equally spaced boxplots. This wrongly implies that the observations were taken at regular intervals.

My y-data (observations) is in a matrix of 1836 rows and 12 columns (much of the data is blank, i.e., NaN). Each of the columns represents data collected at a different time and has been recorded in a vector of length 12.

Ideas?

Answer 1

[Craig Cowled]

Found the answer ...

Need to use 'positions' like this

boxplot(Y,'positions',X)