Hi Jarrod,
As per my understanding, you have multiple files containing categorical arrays, and you want to read through them and plot a histogram.
To do this, I suggest reading all the files, concatenating the categorical values into a global array, and then generating a histogram by extracting unique categories and their counts using the “categories” and “countcats” functions.
Here’s how you can achieve that:
1. Start by initializing a categorical array that will store data from all the files.
allData = categorical([]);
2. Now, loop through each file, read the data and convert the relevant column or portion of the data to a categorical array.
% 'data' is the output of readtable, which reads the file within the loop
curFileData = categorical(data.YourColumnName);
3. After reading the data from each file, concatenate the current categorical array with the main array.
allData = [allData; curFileData];
4. Use the “categories” function to find the unique categories in the concatenated array.
uniqueCategories = categories(allData);
5. Use the “countcats” function to get the count of each category.
counts = countcats(allData);
6. Finally, plot a bar graph using the counts for each category.
bar(counts);
xticklabels(uniqueCategories);
Refer to the following MathWorks Documentation link, to know more about “countcats” function:
Hope this helps.
