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Why am I not getting a colorcoded plot?

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Muazma Ali
Muazma Ali 2022 年 7 月 31 日
回答済み: Image Analyst 2022 年 7 月 31 日
Hi
I dont understand why I am not getting a colorcoded plot, it shd be colorcoded with the z-values but it isnt

回答 (2 件)

Dyuman Joshi
Dyuman Joshi 2022 年 7 月 31 日
編集済み: Dyuman Joshi 2022 年 7 月 31 日
You are using plot3 to make your graph, in that case, you can not change the color of the points in line individually.
Use scatter3. I am copy pasting your data here -
x=[500;600;400];
y=[1;2;3];
z=[0.9;0.7;0.1];
scatter3(x,y,z,20,x,'filled')
%%5th input color ^
colorbar

Image Analyst
Image Analyst 2022 年 7 月 31 日
This will do it:
osmotisk_data = readtable("tester_tabeller.xlsx")
x = osmotisk_data{:,1};
y = osmotisk_data{:,2};
z = osmotisk_data{:,3}
% surf(x,y,z,'linestyle','none','marker','o')
numPoints = size(z, 1)
% Make a colormap with, say, 256 potential colors.
numColors = 256;
cmap = jet(numColors)
% Get the rows of the colormap that each value of z should take on.
colorIndex = round(rescale(z, 1, numColors))
for k = 1 : numPoints
thisColor = cmap(colorIndex(k), :)
plot3(x(k), y(k), z(k),'.', 'Color', thisColor, 'MarkerSize', 100)
hold on;
end
colormap(cmap);
colorbar
fontSize = 20;
xlabel('x', 'FontSize',fontSize);
ylabel('y', 'FontSize',fontSize);
zlabel('z', 'FontSize',fontSize);
grid on
Note that the color of the spot corresponds to the value of Z.

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