Multiplying elements of a vector

Question

Stephen Warren 2020-6-28

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/555952-multiplying-elements-of-a-vector

编辑： madhan ravi 2020-6-28

I'm creating a function to find areas of shapes. It takes two inputs, the first is a vector and the second is a variable number.

function area = area_calculator(A, num)
switch num
    case 1   % Circle
        r = norm(A);
        A = pi*r^2   % Area
    case 2     % Rectangle
        A = b*h % Area; I want to multiply vector element 1 by vector element 2
end

So if I give it

>> area_calculator([2,4], 2)

I'm wanting b*h to be 2*4

I'm unsure how to instruct matlab to perform multiplication within the vector

Thank you very much

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Answer 1

madhan ravi 2020-6-28

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/555952-multiplying-elements-of-a-vector#answer_458146

编辑：madhan ravi 2020-6-28

在 MATLAB Online 中打开

Use prod() to perform multiplication within a vector.

function area = area_calculator(vector, num)
switch num
    case 1   % Circle
        r = norm(vector);
        area = pi*r^2   % Area
    case 2     % Rectangle
        area = prod(vector);% or you can use vector(1)*vector(2) % Area; I want to multiply vector element 1 by vector element 2
end