How to find the integral of some values?

Hello community!

I have a file on excel with some values which are the output signal. So, I want to find the integral of these values.

How to do that in Matlab or Simulink?

PS. I have imported the excel file on workspace

Thanks in advance!

Answer 1

[Star Strider]

use the trapz (or cumtrapz) function (depending on the result you want). It would be best to also have an independent variable (for example, time) as well as part of the integration, if you have access to it.

[RoBoTBoY]

I changed the excel file with a new one which have time inside.

I run this function but i took this error

[Star Strider]

Your comment does not give me enough information, since I do not have the file you are using, or the code you are using to read it.

However using the available data and creating a ‘Time’ vector for it to test the code, this works:

T1 = readtable('Vout.xlsx', 'PreserveVariableNAmes',1);
Time = table(linspace(0, numel(T1(:,1)), numel(T1(:,1))).'*1E-3, 'VariableNames',{'Time'}); % Create ‘Time’ Vector
T1 = [Time T1];
IntVdt = trapz(T1{:,1}, T1{:,2});                                                           % Integral Of 'Vout' With Respect To Time

Make appropriate changes to get it to work with your table. It works with this one.

.

[RoBoTBoY]

Could you explain furthermore what will change in above code?

I had a column with time in my file.

[Star Strider]

Assuming that your table is like the one I created, just use the ‘IntVdt’ assignment to calculate the integral. If it is differen, I need to know the details of the one you are using.

My code extracts the numerical values from the table (note the curly braces {}) and uses them as arguments to trapz. See the documentation on table for more informaiton on how to get data from them.

[RoBoTBoY]

Thank you very much!

[Star Strider]

As always, my pleasure!