How can i apply vector of time in this function?

Question

Samantha Pham 2020-9-22

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https://ww2.mathworks.cn/matlabcentral/answers/598087-how-can-i-apply-vector-of-time-in-this-function

移动：Steve Miller 2022-12-20

在 MATLAB Online 中打开

I have these codes below that calculate I and Is.

When i use Brightness(40,10,3), it gave me the desired result. This is the single time value

i want to use Brightness with vector like this: Brightness(40,0:0.01:10,3), how do i change the codes below to use this

Note: this is errors i received when i tried to use for vector time value --> Variable y has an incorrect value. Your function was unable to calculate the correct brightness for multiple times (0:0.01:10). Utilize Eq. 1 to calculate the brightness without factoring in the power surge. Utilize Eq. 2 to calculate the ADDITIONAL brightness caused by the power surge. However, some time values in the vector will be less than the surge time; therefore, they will not have the additional brightness added by the surge. Use logical statements to add the additional surge brightness only to values at times greater than the time of surge.

function I = Brightness(Power, Time, Surge)
    I = 15*Power*( 1 - 1.4*exp(-Time).*sin( 1.43*Time + pi/4 )); %equation 1
    Is = 10*Power*exp(-1)*sin(1.43/2);                           %equation 2
    for i = 1:length(Time)
    if Time(i) > Surge
    I(i) = I(i) + Is;
    end
end

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Turlough Hughes 2020-9-22

Happy to help :)

Adam Danz 2020-9-22

编辑：Adam Danz 2020-9-22

在 MATLAB Online 中打开

No need for the for-loop. Use indexing.

I = 15*Power*( 1 - 1.4*exp(-Time).*sin( 1.43*Time + pi/4 )); %equation 1
Is = 10*Power*exp(-1)*sin(1.43/2);                           %equation 2
idx = Time < Surge;
I(idx) = I(idx) + Is;

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