how to program given formula

Question

Avenger2020 2020-11-7

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https://ww2.mathworks.cn/matlabcentral/answers/639290-how-to-program-given-formula

编辑： Avenger2020 2020-11-7

采纳的回答： VBBV

Neeed help on how to write this formula in matlab.

if n=100

i=(1,.....,n)

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Answer 1

VBBV 2020-11-7

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https://ww2.mathworks.cn/matlabcentral/answers/639290-how-to-program-given-formula#answer_536905

编辑：VBBV 2020-11-7

在 MATLAB Online 中打开

 % if true
    % code
 % end
x= 1:100;y = linspace(2,250,length(x));
Fx = diff(x,1);
Fy = diff(y,1);
L = sqrt(Fx.^2 + Fy.^2);

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Avenger2020 2020-11-7

编辑：Avenger2020 2020-11-7

what if the i-1 doesn't mean a actual value of 1 and it means to minus the previous x and y values. so if the first x value is 14 and the second x value is 16 it means to minus 16 from 14. For example, x2=xi=16 and x2-x1=xi-1=14. is there a way to program it to call the previous values and minus them? sp its basically saying the xi is the "i" th value in the matric and the "i-1" is the "i" value minus the previous value in sequence.

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Answer 2

Bryant Pong 2020-11-7

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https://ww2.mathworks.cn/matlabcentral/answers/639290-how-to-program-given-formula#answer_536900

在 MATLAB Online 中打开

Assuming that you have arrays of values for x and y:

n = 100;
% Preallocate memory to save some time (n - 1 values)
l = zeros(1, n - 1);
for i = 2:100
    deltaX = x(i) - x(i - 1);
    deltaY = y(i) - y(i - 1);
    l(i - 1) = sqrt(deltaX^2 + deltaY^2);
end