Matlab question

Question

a) Write a MATLAB script that fits a straight line and to the data set given below and plots the given data as points(o) and fitted data as a line.

d |15.5 33.07 53.39 140.24 301.03 _________________________________________

F | 0.0491 0.0981 0.1962 0.4905 0.9810

b) Use MS Excel to fit a straight line to the data set given above. Plot given data and fitted line. For F=md+n, find the values of m and n.

Answer 1

Either type these in one line at a time at the prompt to understand step by step, or store in a .m file and run. use the Matlab (or Octave) help function for commands do you don't understand.

x = [15.5 33.07 53.39 140.24 301.03]

y=[0.0491 0.0981 0.1962 0.4905 0.9810]

p = polyfit(x,y,1)

xp = 0:300

plot(xp,polyval(p,xp));

hold on

stem(x,y,'r');

Answer 2

I have uploaded a spreadsheet for you that shows the equation of this trend line...

The filename name is Best Fit Trend Line and R Coefficient xls

and it is upload in the RESOURCES section under toolkit under this link

The equation has slope and intercept, respectively, of:

The R-coefficient is essentially 1, which means the data points

line up nicely