Create a code in matlab that will:

Import a file named "example".This code will create the cell array example containing ten arrays, one for each column in the file. We want to focus on cells 4 and 5. Cell 4 being the date and cell 5 being co2. We want to plot the graph the graph of cells 4 and 5. However the graph contains some negative value which we want to remove by using masking technique. The negative values are in 1, 2, and 6 values of cell 4(c02).