Plotting standard deviation on MATLAB

Question

I have the following code but Im having issues trying to make this plot the standard deviation for the vector 'Ibig'. When i run the code i get an error saying that 'x2' in the 8 isnt the same vector size. How can i fix this problem or is there another way to plot the standard deviation?

y = Ibig;
x = 1:numel(y);
std_dev = std(y);
curve1 = y + std_dev;
curve2 = y - std_dev;
x2 = [x, fliplr(x)];
inBetween = [curve1, fliplr(curve2)];
fill(x2, inBetween, 'g');
hold on;
plot(x, y, 'r', 'LineWidth', 2);

The question is unclear for me. What does "Im having issues trying to find x2" mean? What is x2? What issues do you have? — Thomas Sablik
– Thomas Sablik, Commented Apr 3, 2021 at 18:17
Apologies, i have updated the description @ThomasSablik. Essentially i need to figure out a way to fill in the area between two line plots (In this case curve1 and curve2). — Shaun
– Shaun, Commented Apr 3, 2021 at 18:36
What format does y have? Your code works if y is a row vector (1 x n). It doesn't work for column vectors or arrays with higher dimension. — user15388024
– user15388024, Commented Apr 3, 2021 at 18:38
@jabaa have updated the description to show that its a (n x 1) column vector. Is there anyway that i can change this so that it is a row vector or is there another way to plot this as a standard deviation? — Shaun
– Shaun, Commented Apr 3, 2021 at 18:47

user15388024 · Accepted Answer · 2021-04-03 18:48:02Z

2

Your code works with row vectors but not with column vectors. In your image you are showing a column vector. You have to transpose it:

y = Ibig.';
x = 1:numel(y);
std_dev = std(y);
curve1 = y + std_dev;
curve2 = y - std_dev;
x2 = [x, fliplr(x)];
inBetween = [curve1, fliplr(curve2)];
fill(x2, inBetween, 'g');
hold on;
plot(x, y, 'r', 'LineWidth', 2);

answered Apr 3, 2021 at 18:48

user15388024

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