MATLAB: Creating a waterfall plot

plot

I have data in a 2d plot, but I want to display it as a "waterfall" with the first value x(0),y(0) at the top, and x(i),y(i) at the bottom. You can visualize just flipping the plot over the x axis. This can be simply done by inverting the y data, but then on the plot, I have negative y values when in reality, they are positive. Is there any way to "flip" the plot?

Best Answer

flipud() or fliplr() ?

doc fliplr
doc flipud

Related Solutions

MATLAB: How to put stacked plots in the same graph

Alan,

To plot the data all in the same plot, do something like the following.

x1 = 0:.01:1;
y1 = x1.^2;
x2 = .5:.1:1;
y2 = -1*x2 + 10;
fHand1 = figure;
aHand1 = axes('parent', fHand1);
hold(aHand1, 'on')
plot(x1, y1, 'parent', aHand1);
plot(x2, y2, 'parent', aHand1);

To make the plots scale independent - so the min of the plot is at the bottom and the max is at the top - you need to normalize the y values before plotting. In this case, it helps to remove the y axis labels to avoid confusion. Here is how I did it.

y1 = (y1 - min(y1)) / (max(y1) - min(y1));
y2 = (y2 - min(y2)) / (max(y2) - min(y2));
fHand2 = figure;
aHand2 = axes('parent', fHand2);
hold(aHand2, 'on')
plot(x1, y1, 'parent', aHand2);
plot(x2, y2, 'parent', aHand2);
set(aHand2, 'YTickLabel', [])

Let me know if this solves your problem.

~Jonathan

MATLAB: How to mirror the Y axis from -x to x

With only a description, I can only guess. However, assuming that your data are row vectors, something like this will work:

x = -20:20;                                     % Create Data

y = exp(-(x.^2)/11) + rand(1,size(x(x>0),1));   % Create Data
y = y + [zeros(1,size(x(x<=0),2)) 0.5*rand(1,size(x(x>0),2))];
x_full = [x(x<=0), -fliplr(x(x<0))];            % Define & Flip X-Values For ‘(x<=0)’

y_full = [y(x<=0),  fliplr(y(x<0))];            % Define & Flip Y-Values For ‘(x<=0)’

figure(1)
plot(x_full, y_full)                            % Plot Result
grid

If they are column vectors, use flipud instead of fliplr, and replace the commas with semicolons:

x_full = [x(x<=0); -flipud(x(x<0))];            % Define & Flip X-Values For ‘(x<=0)’
y_full = [y(x<=0);  flipud(y(x<0))];            % Define & Flip Y-Values For ‘(x<=0)’

Best Answer

Related Solutions

MATLAB: How to put stacked plots in the same graph

MATLAB: How to mirror the Y axis from -x to x

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