Integration of one array variable wrt other array variable

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Somnath Kale 2021-1-29

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https://ww2.mathworks.cn/matlabcentral/answers/730358-integration-of-one-array-variable-wrt-other-array-variable

编辑： Somnath Kale 2021-2-1

Good PE Loop.txt

I am trying to integrate the current with respect to time to get polarization value. i have both time and current array can anyone help me with this to get proper integration

I am currently using following code:

Thickness = 15*10^-4;
Area = 350
data = readtable('Good PE Loop.txt')
time = data{:,1}
current= data{:,4}
polarization =data{:,5}
field = data{:,2}/Thickness
plot(time,current)
p1 = cumtrapz(current)
p = (10^5/3.5)*p1
plot(time,p)
plot(field,p)

but the value of polarization which im getteing is not correct. and im unable detect the mess up!

thanks in advance!!

datafile is attached. (my calculated values should be as in the array polarization)

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回答（1 个）

Amanpreetsingh Arora 2021-2-1

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If the time spacing for integration is non uniform, then you will also need to pass the time vector to "cumtrapz" or else it assumes unit spacing for integration. Try passing time vector in the following fashion and see if it yields expected results.

p1 = cumtrapz(time,current)

For more information on function "cumtrapz", refer to the following documentation.

https://in.mathworks.com/help/matlab/ref/cumtrapz.html

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Amanpreetsingh Arora 2021-2-1

Does the integral have an initial condition? If it has then you will have to add that initial value to "p" becuase "cumtrapz" computes the definate integral considering zero as initial condition.

Somnath Kale 2021-2-1