How to plot an integral

Question

0 个投票

Hello!

I need some help plotting the following:

This is what I have:

syms x
kw = 91371;
CaO= 1.81*10^(-4);
FaO= 0.1233;
K = 1.29;
fun =FaO*((1+K*CaO*(1-x))/(kw*CaO*(1-x)))
W=int(fun);
fplot(W,[0 1

But nothing comes out on the graph. I want to plot W on the Y-axis and x on the X-axis, between 0 and 1 (because it's a conversion in chemistry).

Does anyone know what I'm doing wrong?

5 个评论
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Marina Gonzalez 2019-6-15

Sure!

W =
 
(10621383255117913671*x)/6101500778987273584640000 - (2711395674095616*log(x - 1))/363677786528305625

Walter Roberson 2019-6-15

In this calculation W is imaginary below 2.0007245246191665436401515314702

Answer 1

Star Strider 2019-6-15

2 个投票

‘But nothing comes out on the graph.’

The result of the int function is a constant. At best, you will get a straight line.

I am not certain what you want. You can get it to plot as a function of the upper limit of integration by creating a function from it:

syms x a 
kw = 91371;
CaO= 1.81*10^(-4);
FaO= 0.1233;
K = 1.29;
fun = FaO*((1+K*CaO*(1-x))/(kw*CaO*(1-x)));
W(a) = int(fun, x, 0, a);
fplot(W,[0 1])