Create a 2D plot with irregular axes

I have a dataset with associated x and y coordinates, but the coordinates for both axes are not at regular intervals. Is there a way to make a map (ideally 2D but I would accept 3D) that shows these results - the values represented by colour - at their coordinates (akin to imagsc)?

Answer 1

[Star Strider]

The plot function does not care if the data are not regularly sampled. It wil plot them appropriately regardless.

Example —

t = sort(rand(1,100));
s = sin(5*pi*t);

figure
plot(t, s, '.-')
grid
axis('padded')

sp = s;
sp(end) = NaN;
c = sp;

figure
patch(t,s,c, EdgeColor='interp',Marker='s',MarkerFaceColor='flat')
grid
axis('padded')
colormap(turbo)

I am not certain what you want.

.

[Sam Hurrell]

I am not looking to create a line plot, but a map plot (akin to the attached).

[Star Strider]

I am not certain what the image is, or what it represents.

A histogram2 plot could work.

Try something like this —

imshow(imread('TT3.png'))

x = randn(1000,1);
y = randn(1000,1);

figure
histogram2(x, y, 50, FaceColor='flat')
colormap(turbo)
% axis('equal')
axis('square')
view(0,90)

Make appropriate changes to get the result you want.

.

[Sam Hurrell]

The attached image is a C-scan plot of data with both x and y coordiantes. The image is achieved via a wireframe plot that is made solid. The histogram plot would leave too many blank spaces that are undesirable.

Answer 2

[Walter Roberson]

pointsize = 20;
scatter(x, y, pointsize, Dataset(:))

This will produce colored round dots at the given locations.

Producing square or rectangular dots would be more work.

[Walter Roberson]

Ah, I guess you can specify square markers for scatter() if you need to plot squares.

[Sam Hurrell]

Is there any way to merge the scatter points to create an image that looks like the attached?