Question

Use the Matlab to solve this one, please!

Task 4 Download the temperatures.txt file from Moodle. The file contains temperature data which has beern collected once a day and contains noisy data. Write a MATLAB m-file that performs the following: Read the temperature values from temperatures.txt into a vector A. B. C. Plot the temperature against time using red diamond markers. Without using loops, remove the noisy data using the following rules: I Any temperature value above 45°C is invalid I Any temperature value below 0°C is invalid II The temperature values from day 5, 13 and 42 are invalid Do not set the invalid temperatures to O or NaN! Use logical statements instead. After removing the invalid temperature values, plot the valid temperature values against the corresponding valid times in a new figure as blue circles. D. Use either the fgetl) or the importdata() functions to import your data. You may need to use the str2num() command. HINT: If temperatures are stored in T, try valid_indices T> 45 HINT: What is the result of T(valid indices)? temperatures Notepad File Edit Format View Help 34.7114, 34.7512, 34.8033, 34.8360, 40.0000, 34.8742, 64.6931, 66.4996, 59.6849, 64.1619, 34.9951, 34.9892, 5.0000, 35.0829, 34.9854, 34.9886, 34.9926, 34.97

Answer 1

Note: I am unable to check whether the code is running or not.But, checked the syntax of every command used and tried to explain the steps/logic used in the program

Program:

%Import data from file

A=importdata("temperature.txt")

%convert string to number

T=str2num(A)

%to find the number of input data of temperature

k=size(T)

%creating a matrix with consequent number of days

day=1:k

%to find the indices of invalid temperatures

indices=find((T<0)&(T>45))

%removing corresponding elements in both T and day

T(indices)=[ ]

day(indices)=[ ]

%to find the indices with invalid day

wd=ismember(day,[5 13 42])

%removing corresponding elements

day(wd)=[ ]

T(wd)=[ ]

%plotting with day in x axis and temperature in y axis

plot(day,T,'d')