Help Plotting Piecewise functions
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I need help plotting the following piecewise function. I attatched the question.
This is what I have so far:
syms x
y = piecewise(0<=x<=3, 4*x^1/3, 3<x<=6, pi^x+e) % this is the line that is saying there is an error.
fplot(y)
Answers (2)
Walter Roberson
on 1 Sep 2019
Chaining equalities like that is only supported in very recent MATLAB. Also you are using the wrong exponent:
y = piecewise(0<=x & x<=3, 4*x^1/3, 3<x & x<=6, pi^(x+e))
If e is intended to be the base of the natural logs then chances are you are going to need to define e as e is not built-in constant in MATLAB. e = exp(1);
9 Comments
Brianna Selles
on 1 Sep 2019
Walter Roberson
on 1 Sep 2019
y = piecewise(0<=x & x<=3, 4*x^1/3, 3<x & x<=6, pi^(x+exp(1)))
Question: what is the value of the function for negative x or x > 6 ?
Brianna Selles
on 1 Sep 2019
Brianna Selles
on 1 Sep 2019
Walter Roberson
on 1 Sep 2019
No. Look carefully at the second equation. The x + e is all the same font size and is all raised higher than the pi.
. If it were pi^x+e then it would have been 
Brianna Selles
on 1 Sep 2019
Brianna Selles
on 1 Sep 2019
Walter Roberson
on 1 Sep 2019
syms x
e = exp(1)
y = piecewise(0<=x & x<=3, 4*x^1/3, 3<x & x<=6, pi^(x+e))
fplot(y,'c')
madhan ravi
on 1 Sep 2019
madhan ravi
on 1 Sep 2019
Edited: madhan ravi
on 1 Sep 2019
You are almost there , change e to exp()
syms x
y = piecewise(0<=x<=3, 4*x^1/3, 3<x<=6, pi^(x+e)) % Note the parentheses around pi
fplot(y,'c') % change this line
doc fplot % to see more examples
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