plotting a matrix( polynomial order )

Question

Amjad Green 2018-4-16

回答： Star Strider 2018-4-16

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

Answer 1

Star Strider 2018-4-16

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