Hi Gustav,
The approach to calculate the inflation rate based on the Consumer Price Index is correct. The inflation rate is typically calculated as the percentage change in the CPI from one period to the next.
However, you mentioned that your code is not working. One potential issue could be that the variable CPI_inflation is not pre-allocated before the loop, which can cause issues in MATLAB. Another issue might be related to indexing. The way you are extracting CPI_annual using data_annual(:,6) may not return a numeric array directly. Instead, it returns a table with one column. You need to access the data within the table. Following is a sample code for the same:
CPI_annual = data_annual.CPIAUCSL; % define variable
CPI_inflation = zeros(size(CPI_annual)); % pre-allocate the array
for jj = 2:length(CPI_annual);
CPI_inflation(jj) = (CPI_annual(jj)-CPI_annual(jj-1))./CPI_annual(jj-1)*100;
end
Also, use size(CPI_annual) to dynamically determine the number of rows. This ensures that the loop runs for each element in CPI_annual, regardless of how many elements there are.
It would be beneficial if you could share the specific issue so that I can assist you more effectively.
Hope this helps!
