Why am I not getting a colorcoded plot?

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Muazma Ali
Muazma Ali on 31 Jul 2022
Answered: Image Analyst on 31 Jul 2022
Hi
I dont understand why I am not getting a colorcoded plot, it shd be colorcoded with the z-values but it isnt

Answers (2)

Dyuman Joshi
Dyuman Joshi on 31 Jul 2022
Edited: Dyuman Joshi on 31 Jul 2022
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 on 31 Jul 2022
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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