MATLAB: Plotting a matrix( polynomial order )

matrixplot

the matrix is [r,c] size
each row should have an equation of x^(c-1) +x^(c-2) … i need the functions to plot on the same graph
for example A=[2 5 8;-3 4 6]
first equation should be 2.*(x.^2) +5.*x +8
second equation should be -3.*(x.^2)+4.*x +8
example2 A=[4 2;3 5]
f1=4.*x +2
f2=3.*x+5

Best Answer

Use the polyval function:

A1 = [2 5 8;-3 4 6];
A2 = [4 2;3 5];

x = linspace(-5, 5);                                    % Arbitrary ‘x’

figure(1)
Axh = axes('NextPlot','add');
for k1 = 1:size(A1,1)
    y = polyval(A1(k1,:),x);
    plot(Axh, x, y)
end
grid

figure(2)
Axh = axes('NextPlot','add');
for k1 = 1:size(A2,1)
    y = polyval(A2(k1,:),x);
    plot(Axh, x, y)
end
grid
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