consulting 3D graph
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Hi
I have a question about consulting a 3D graph design
I have in my data:
- Samples
- Frequency axis
- And the amplitude by sampling for freq
How would you present this data in a three-dimensional graph
Functions like surf are irrelevant because the Z axis does not depend on X&Y
Z is a known value
tnx :)
Example
5 个评论
Rik
2020-11-13
What kind of plot do you want? A scatterplot?
Bjorn Gustavsson
2020-11-13
What you have presented is data Z with size [32 x 7] at 7 frequencies and 32 "samples", in a plaid frequency-sample grid. For that surf is a reasonably suitable function to illustrate the data, as is pcolor (except for the fact that the last row and column disappears). You could also use scatter, (or plot3).
Unless you can explain why surf is "irrelevant".
Shahar ben ezra
2020-11-13
Rik
2020-11-13
You don't need to do that, it is just a way in which you can create some example data. You can just use the actual Z values.
Shahar ben ezra
2020-11-13
编辑：Shahar ben ezra
2020-11-13
采纳的回答
Cris LaPierre
2020-11-13
编辑：Cris LaPierre
2020-11-13
0 个投票
I think the natural choice here is a spectrogram. Samples go along one axis, frequency along the other, and color is used to convey power. Look at some of the examples on the linked page.
6 个评论
Shahar ben ezra
2020-11-13
Cris LaPierre
2020-11-13
编辑：Cris LaPierre
2020-11-13
Could you copy/paste your code here? Use the CODE formatting option. You can attach your data using the paperclip icon as well.
Shahar ben ezra
2020-11-13
Ok, so spectrogram is designed to take in the raw data and extract the frequency content. Your data appears to have already done that. So you really do just need a visualization method.
A simple 2D approach could be heatmap.
my_date = readmatrix("3D PLOT.xlsx");
vec_x_freq = my_date(1,2:end);
vec_y_samp = my_date(3:end,1);
matrix_z = (my_date(3:end,2:end));
figure
heatmap(matrix_z,"XDisplayLabels",vec_x_freq)
colormap parula
If you want a 3D plot, then surf would work, though your data doesn't make that a nice visualization.
figure
s=surf(matrix_z);
s.FaceColor = "interp";
colorbar
Another option might be a 3D bar chart.
figure
bar3(-matrix_z)
zlim([70 100])
xticklabels(vec_x_freq)
xlabel('Frequency')
ylabel('Sample')
zticklabels("-"+zticklabels);
Cris LaPierre
2020-11-13
编辑：Cris LaPierre
2020-11-13
The best way to explore plotting options is to select the variable in your workspace, then open the Plots tab. All possible options for that variable will be displayed. Expand the list to see them all. Find one you like and select it.
Shahar ben ezra
2020-11-13
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