I need to draw a level curve. I had data for x-axis, y-axis and z-axis through which I can draw 3D plot. However, f(x,y) is unknown. How can create the level curves for my data?
MATLAB: How to make level curves if function is unknown
level curves
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Try this:
x = linspace(0, 2*pi, 50); % Independent Variable
y = sin(x); % Dependent Variable
z = [ones(size(x)); zeros(size(x))]; % ‘Z’ Matrix
figure(1)surf([x; x], [y; y], z)grid onaxis equalAlso, if you want more ‘levels’ in the z-direction:
x = linspace(0, 2*pi, 50); % Independent Variabley = sin(x); % Dependent Variablez = [(1:-0.2:0)'*ones(size(x))]; % ‘Z’ Matrixfigure(1)surf(repmat(x,size(z,1),1), repmat(y,size(z,1),1), z)grid onaxis equalThe ‘(1:-0.2:0)’ in the z calculation sets the number of ‘levels’ and values of the ‘levels’. Experiment with it to get the result you want.
NOTE — This requires x and y to be row vectors.
EDIT — Added plot image.
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