Please provide the code for the problem!

stringB is given below:

stringB = '30141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaAB753014159LM535897T3115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB87530141592653589793115matlab468544185161590MaTLaB875'

Problem 1: Download the file stringB.mat from TritonED and perform the following exercise. This file contains a string named stringB. (a) Search for any instances of 'matlab' and replace them to 'MATLAB'. Put the answer in pla. (b) How many times does 'matlab' occur in the string? Put the answer in plb. (c) Determine the percentage of characters that are letters (e.g. a-z) in the string. Put the answer in pic. Report the answer as a decimal (i.e. 99% is 0.99) and in double precision, do not use a string. (d) Remove the characters prior to the first letter 'm' in the string and put the answer in pld. e) Replace all letters in the string with white spaces and put the answer in ple