How do I concentrate my interpolation coloring around specific data ranges?

Hi, im trying to plot an area graph with interpolated shading, in which i use patch(). Everything works out perfectly but i'm graphing a set of datapoints that range from 4500-5500. So naturally when I put the plot range to that value it only shows one color. Is there a way to concentrate the interpolation between the max and min value points of my data?

I had to add zeroes in the beginning and end of my data vector so I could enclose the data between x axis and my value points

Answer 1

[Andrew Newell]

The simplest solution would be to change the mapping of data values to the colormap using caxis, e.g.:

caxis([4500 5500])

[Hannah]

I tried that but it turns the whole plot one color.

[Andrew Newell]

I don't see why it would - unless all the data points are much closer together than that. Maybe you need to provide some code to clarify the question.

[Hannah]

Pool31_35_Storage = [0 5042.7 5046.0 5052.9 5061.1 5067.2 5089.2 5085.2 5100.7 5106.5 5089.2 5067.9 5056.4 5090.5 5040.8 5015.8 4984.9 4952.0 4932.9 4954.5 4951.0 4913.3 4920.4 4938.6 4974.5 0];
x=linspace(1,26,26);
n = 26;
N = length(x); 
color = [Pool31_35_Storage(:)-max(Pool31_35_Storage)];%; x(:) zeros(N,1)];
caxis([4000 5500]);
H1 = patch(x, Pool31_35_Storage, color); 
hold on 
set(H1, 'FaceColor', 'interp',  'EdgeColor', 'none');

[Andrew Newell]

Ah - your color values are negative. Try caxis(-[5500 4000]).

[Hannah]

Ohh, now its interpolated again. Is there a way to concentrate the color so that patch stays blue until about 4000 or so and then starts interpolating?

[Andrew Newell]

Perhaps the easiest approach would be to tweak the colormap using the colormapeditor. The documentation also describes how you can save the colormap after you have edited it.