%% Clear the command line, clear all workspace variable clc, clear %% Import sam

Question

%% Clear the command line, clear all workspace variable
clc, clear

%% Import sample weather data
wd = xlsread('weather_data.xls'); % read in the data to wd using xlsread
wd = wd'; % transpose wd, so that months are in columns
month = 2 % set the month of January
%% Average in a month
month_values = wd(:,month)
month_values(month_values<0)=[]
average_in_a_month = mean(month_values)

%% Max in a month
max_in_a_month = max(wd(:,month))

%% days of month when zero inches fell
days_when_zero = find(month_values==0)

%% # of days zero inches fell
% num_days_when_zero = numel(days_when_zero)
num_days_when_zero = sum(month_values==0)
%% days when some rain fell
num_days_when_zero = numel(days_when_zero)

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%% average inches of only days in which some rain fell

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Explanation / Answer

days when some rain fell
num_days_when_not_zero = length(month_values) - sum(month_values==0)

average inches of only days in which some rain fell

average_when_rain_not_zero= sum(month_values)/num_days_when_not_zero

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