How to make colororder function working in scatter plot

2025 3 2
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I am trying to use the colororder function in my scatter plot, but somehow it is not working and couldn't able to understand why.
% Data file is attached
figure(1);
newcolors=["#FF0000" "#00FF00" "#0000FF" "#00FFFF" "#FF00FF"];
colororder(newcolors);
s=scatter(lon,lat,36,index(1,:),"filled");
ax = gca;
ax.FontSize = 12;
xticks([66 74 82 90 98]);
xticklabels([66 74 82 90 98]);
ylim([6.5 39.5]);
yticks([8 14 20 26 32 38]);
ylabel(ax,"Latitude","FontSize",20);
xlabel(ax,"Latitude","FontSize",20);

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Voss
Voss 2025-3-2
编辑：Voss 2025-3-2
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Ran in:
When you specify a vector of values for the colors (index(1,:) in this case), those values are interpreted as indices into the axes' Colormap, as explained here.
  • Vector of colormap indices — A vector of numeric values that is the same length as the x and y vectors.
Therefore you need to set the axes Colormap rather than its ColorOrder. See below for one way to do that.
load Data
% Data file is attached
figure(1);
newcolors=["#FF0000" "#00FF00" "#0000FF" "#00FFFF" "#FF00FF"];
s=scatter(lon,lat,36,index(1,:),"filled");
ax = gca;
ax.Colormap = hex2rgb(newcolors);
ax.FontSize = 12;
xticks([66 74 82 90 98]);
xticklabels([66 74 82 90 98]);
ylim([6.5 39.5]);
yticks([8 14 20 26 32 38]);
ylabel(ax,"Latitude","FontSize",20);
xlabel(ax,"Latitude","FontSize",20);
When no colors are specified in the scatter() call, then the resulting scatter objects are colored according to the axes ColorOrder, with one color per scatter object (not necessarily one color per scatter point). [The examples in the scatter documentation showing the effect of changing the axes ColorOrder create multiple scatter objects, letting the scatter function determine their colors automatically from the axes ColorOrder.] That is not relevant to this case, since your scatter object needs to have multiple colors in it, in order for its points to be colored according to index(1,:) and newcolors.

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Walter Roberson
Walter Roberson 2025-3-2
  • Vector of colormap indices — A vector of numeric values that is the same length as the x and y vectors.
However, the more detailed explanation is
Specify a row or column vector of numbers. The numbers map into the current colormap array. The smallest value maps to the first row in the colormap, and the largest value maps to the last row. The intermediate values map linearly to the intermediate rows.
If your plot has three points, specify a column vector to ensure the values are interpreted as colormap indices.
You can use this method only when x, y, and sz are all vectors.
So min(vector) is mapped to the first color and max(vector) is mapped to the last color and everything between is interpolated.

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