MATLAB: Hi all! Is there a way to initialize row vectors like this:

initializing row vectors

R1= x1; G1= x2; B1= x3; R2= x4; G2= x5; B2= x6; R3= x7; G3= x8; B3= x9; And so on Please help!

Best Answer

"No, it's a single row vector."

Based on this I will assume that R,G and B are also row vectors.

Say,

 x=1:30

You can divide elements in x as

 R=x(1:3:end-2);
 G=x(2:3:end-1);
 B=x(3:3:end);

This will give you R, G, B as row vectors with elements from x.

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MATLAB: How to write a1=1;a2=2;a3=3; from A

Do NOT do this

This would actually be horribly slow, pointlessly complex, obfuscated, and very buggy way to write your code. You would make your code hard to debug, and a pain to work with. Read this to know why:

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

Using indexing would be simple, neat, and very efficient. You should use one array and indexing. Indexing is the solution you should be using, because it is the most efficient way to write MATLAB code, is simple, neat, and very easy to debug. Indexing is explained quite well in the MATLAB introductory tutorials, which are highly recommended for all beginners:

https://www.mathworks.com/help/matlab/getting-started-with-matlab.html

MATLAB: Undifined function or variable x

function better_homes_and_gardens
    R1 = 2;
    R2 = 1;
    s1 = [-2;2];
    s2 = [3;-1];
    n1 = 2;
    n2 = 1;
    %for values of x and y between -5 and 5
    landscape(-5:5, -5:5);
     
    function M = landscape(x, y)
       M = H1(x, y, R1, s1, n1) + H2(x, y, R2, s2, n2);
        function h1 = H1(x, y, R1, s1, n1)
           h1 = (1./(1+(R1/sqrt((x-s1(1)).^2+(y-s1(2)).^2)).^n1));
        end
        function h2 = H2(x, y, R2, s2, n2)
           h2 = (1./(1+(R2/sqrt((x-s2(1)).^2+(y-s2(2)).^2)).^n2));
        end
        surf(M)
        contour(M)
    end
end

Best Answer

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MATLAB: How to write a1=1;a2=2;a3=3; from A

MATLAB: Undifined function or variable x

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