Math Tec
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Integrating from high to low values
Hi,
I am trying to check integration using two different methods, first by using [function (int)] and second by using summation. I am integration from high to low values (0.1 to 0). I got same result. However, from function I got positive value (0.005) and from summation, negative value (-0.005). I am not sure if that because I am integrating from high to low values so I need to use (dr) in negative value when finding the integration using summation.
I used below code
I am trying to check integration using two different methods, first by using [function (int)] and second by using summation. I am integration from high to low values (0.1 to 0). I got same result. However, from function I got positive value (0.005) and from summation, negative value (-0.005). I am not sure if that because I am integrating from high to low values so I need to use (dr) in negative value when finding the integration using summation.
I used below code
clear all;
clc;
syms x y
y = -x;
z=int(y,x);
v=[0:0.1/19:0.1];
dr=0.1/20;
for i=1:20
x=v(i);
kk(i)=eval(y)*(dr);
end
R1=sum(kk(1,:));
x=0.1;
z1=eval(z);
x=0;
z2=eval(z);
R2=z2-z1;
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