Why am I not getting a colorcoded plot?

Hi

I dont understand why I am not getting a colorcoded plot, it shd be colorcoded with the z-values but it isnt

Answer 1

[Dyuman Joshi]

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

Answer 2

[Image Analyst]

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.