Dividing the values of a vector

Question

Anna Mogilevskaja 2019-12-3

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/494523-dividing-the-values-of-a-vector

回答： Star Strider 2019-12-3

Hello,

I have the following question:

this is my code:

A=[1 1.1; 1.1 1]

l= [sym(2)/sym(3); sym(1)/sym(3)]

w=1

B=[1.09 1.44; 1.44 0.99]

r=linspace(0,1,100)

for k = 1:numel(r)

p(:,k)=(inv(B-(1+r(k))*A))*l

end

The p vector consists out of p1 and p2. After the loop is finished I would like to calculate p1/p2 (also in a loop as I would like to plot p1/p2 against r). Unfortunately, I could not find any references to this case.

Does anyone have a solution for dividing the values of a vector.

Greetings,

Anna

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Stephane 2019-12-3

Maybe try p(1,:) ./ p(2,:), and then plot(r, p(1,:) ./ p(2,:))

Anna Mogilevskaja 2019-12-3

I habe tried this but it did not work out yet:

A=[1 1.1; 1.1 1]

l= [sym(2)/sym(3); sym(1)/sym(3)]

w=1

B=[1.09 1.44; 1.44 0.99]

r=linspace(0,1,100)

for k = 1:numel(r)

p(:,k)=(inv(B-(1+r(k))*A))*l

end

for k = 1:numel(r)

q(:,k)=(p(1,:)(k)./ p(2,:)(k)

end

figure

plot(r,q)

grid

xlabel('r')

ylabel('q(r)')

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Answer 1

Shota Kato 2019-12-3

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q can be calculated as follows

q = p(1,:) ./ p(2,:)

or

q(:,k) = p(1,k) / p(2,k)

Then, you can plot q against r.

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Answer 2

Star Strider 2019-12-3

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/494523-dividing-the-values-of-a-vector#answer_404478

在 MATLAB Online 中打开

Try this:

A=[1 1.1; 1.1 1];
l = [2; 1]/3;                                           % Create As Column Vector
w=1;
B=[1.09 1.44; 1.44 0.99];
r=linspace(0,1,100);
for k = 1:numel(r)
    p(:,k)=(B-(1+r(k))*A)\l;                            % Replace ‘inv’ Call With ‘\’
end
p_div = p(1,:)./p(2,:);
figure
plot(r, p_div)
grid
xlabel('$r$', 'Interpreter','latex')
ylabel('$\frac{p_1}{p_2}$', 'Interpreter','latex')