y-values from a given function
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I have a function and two values of x and I would like to find the values corresponding to the x-values, how should I start ? I was thinking to do for loop but it does not work it only gave me one of the answers (as you can see below)!
for x = 0.36 : 0.40
y = x^4 + 5*x^2 + sqrt(x-1)
end
y =
0.6648 + 0.8000i
1 个评论
John D'Errico
2017-1-9
So your code was wrong. Show your code, and someone will show you how to fix it.
采纳的回答
John D'Errico
2017-1-9
Ok, you posted your code.
As I expected, every time through that loop, you overwrote the previous values.
Worse, what do you think 0.36:0.40 does? It generates a set of values from 0.36 to 0.40 in increments of 1 (ONE)! How many values do you think that creates? ONE: 0.36.
Simplest is to not use a loop.
x = [0.36, 0.40];
y = x.^4 + 5*x.^2 + sqrt(x-1);
Note the use of .^ there. It is there for a reason. Learn about element-wise operations on a vector or array.
help power
4 个评论
Yumi Lee
2017-1-9
You probably want to use element-wise multiply .* rather than matrix multiply *. Read about the differences here:
Yumi Lee
2017-1-11
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