This leads to minc ||Ac − y||, Now for n = 10, xj = 1 + (j − 1)/(n − 1) and yj = e xj , find c1, c2 and c3. Solve problem by using matlab.

[Walter Roberson]

What is your question?

[Chun Kit NG]

just using matlab to write code to solve question. Find c1,c2 and c3.

[Jan]

@Chun Kit NG: This is the question of your homework. But what is your question? The forum will not solve your homework, but if you show your current code and ask a specific question, we assist you to solve it by your own.

Answer 1

[Image Analyst]

Did you code in the equations it told you to? From the question:

n = 10
x = 1 + (1:10 - 1) / (n-1)
y = exp(..........

and then call polyfit() to fit the quadratic? It's literally just 4 lines of code - including the call to polyfit(). I'm confident you can do it!

How do I get help on homework questions on MATLAB Answers? - MATLAB Answers - MATLAB Central

[Chun Kit NG]

can you help me? i almost don't know how to coding and solve it.

[Image Analyst]

I already did. Did you read the link I gave?

You literally just need to look up how to call exp() to do e^x, and then look up polyfit to see how you can get the coefficients from x and y. If I do anymore, which is just a few characters (like around 20 or so), and you turn in my code as your own work, then you may get in trouble with your university for cheating, which we would not want to happen. Some universities use plagiarism detectors that look for that kind of thing.

Did you look up exp() and polyfit() in the help? If not, why not?

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[Chun Kit NG]

I don't know how to continue. How can i input the matrix and solve Ac-y?

[Walter Roberson]

format long g
A = magic(5)

A = 5×5

17 24 1 8 15 23 5 7 14 16 4 6 13 20 22 10 12 19 21 3 11 18 25 2 9

b = [7 3 8 2 4].'

b = 5×1

7 3 8 2 4

c = A\b

c = 5×1

-0.148269230769231 0.184423076923077 -0.0261538461538461 0.0382692307692308 0.320961538461538

A*c - b

ans = 5×1

1.0e+00 * 0 0 0 -2.22044604925031e-16 0