Clear Filters
Clear Filters

graphing with a matrix using matlab

23 views (last 30 days)
Khang Nguyen
Khang Nguyen on 22 Nov 2020
Edited: Mohith Kulkarni on 25 Nov 2020
If I have a reduce normal form Matrix on matlab for example A = [ 1 0 0 3 ; 0 1 0 6 ; 0 0 1 5]
I want to graph it in an equation y = a + bx +cx^2 where a = 3 , b = 6 and c = 5(3,6,5 is the last value in the matrix above). How should i do this. I am trying to solve the lease square problem in linear algebra.
Can you please give me an advice of how to write a code to do this if the matrix increasing.
Thank you

Answers (1)

Mohith Kulkarni
Mohith Kulkarni on 25 Nov 2020
Edited: Mohith Kulkarni on 25 Nov 2020
To plot the equation, refer to the code below.
A = [1 0 0 3; 0 1 0 6; 0 0 1 5]
B = A(:,end) %last column for a,b,c
x = linspace(1,10,10); %initializing x values
y = zeros(10,1)'; %initializing y values
deg = size(A,2)-2;
for idx = 0:deg
y = y+ B(idx+1)*(x.^idx);
end
plot(y,x)
For solving system of linear equations using least squares method, refer to lsqr.
You can also check polyfit for polynomial curve fitting.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!