Summation with for LOOP

Question

Kabir Shariff 2022-5-18

0
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https://ww2.mathworks.cn/matlabcentral/answers/1722185-summation-with-for-loop

评论： Mathieu NOE 2022-5-18

Hello,

I have a function y that is repeated after a certain interval of T. I want to add the value of the previous y to the next value. The proplem is more clear with a diagram as shown below

I want to add the value of the each T to like,

How can I sumUp all the inteaction with a for Loop,like this expression?

here is my code for info

clear
clc
x = linspace(0,50,1000);
v = 10;
a = 0.2254; b = 0.5401;
xT = 0;
for i = 1:4
    xT = xT+v;
y = @(x) ((a*((x-xT)).^-b).*(x>=(xT+1))).^2;
figure(3)
hold on
plot(x,y(x))
end

Merci

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Answer 1

Mathieu NOE 2022-5-18

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https://ww2.mathworks.cn/matlabcentral/answers/1722185-summation-with-for-loop#answer_966480

在 MATLAB Online 中打开

hello

a simple add on to your code :

clear

clc

x = linspace(0,50,1000);

v = 10;

a = 0.2254; b = 0.5401;

xT = 0;

ysum = 0;

for i = 1:4

xT = xT+v;

y = @(x) ((a*((x-xT)).^-b).*(x>=(xT+1))).^2;

ysum = ysum + y(x);

figure(3)

hold on

plot(x,y(x))

end

plot(x,ysum,'--')

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Kabir Shariff 2022-5-18

Thank you, It works!

could you explain to ysum please.

I see its a matrix, My initial idea was to use just the last value at the next T

Mathieu NOE 2022-5-18

my pleasure

the concept is quite simple

at each loop iteration the new y data (y(x)) is summed with the previous one util the nd of the loop. It's doable because every y data comes from the same x data , so you can simply do this y summation and plot it against x;

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