Scatter not showing full precision of data.
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Andreas Hitzler
on 18 Oct 2023
Moved: Walter Roberson
on 18 Oct 2023
I am trying to plot one measurement versus another withing the scatter function as such below but the result is that data is "sampled" at a much lower precision that the two column vectors I am supply it with. I have made sure to specify format long in my script. Any help would be beyond appreciated. I have attached the data below. It has ~16 digits of precision but I am not getting the double precision it says it is (as seen in the graph below).
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1514144/image.png)
figure;
hold on
scatter(ztemp,zrate,".")
ylabel('Angular Rate \omega_z [deg/s]');
xlabel('Rate Sensor Temperature Measurement [deg C]');
title('Angular Rate Measurements Vs. Temperature Sampled and Fitted');
ylim([-0.6 0.6])
xlim([-15 60])
hold off
saveas(gcf,'Angular Rate Measurements Vs. Temperature Sampled and Fitted.png')
2 Comments
Dyuman Joshi
on 18 Oct 2023
format only changes the way how the numerical values are displayed. It has no effect how numbers are stored and used for operations.
I don't understand what exactly your question is.
Accepted Answer
Walter Roberson
on 18 Oct 2023
Moved: Walter Roberson
on 18 Oct 2023
format long g
whos -file data.mat
load('data.mat');
duz = diff(unique(zrate)) ;
min(duz)
min(zrate), max(zrate)
You may have 16 bits of precision, but your zrate is in bands that at least 0.018 apart.
G = findgroups(zrate);
max(G)
You only have 36 different zrate values.
scatter(ztemp,zrate,".")
If you were to increase your ylim enough then the difference of 0.0183 between layers would be insignificant compared to the span, and in that case it would look continuous... but it would not be.
figure();
scatter(ztemp,zrate,".")
ylim([-1 1])
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More Answers (1)
Chunru
on 18 Oct 2023
websave("data.mat", "https://www.mathworks.com/matlabcentral/answers/uploaded_files/1514124/data.mat")
load("data.mat")
figure;
hold on
scatter(ztemp,zrate,".")
ylabel('Angular Rate \omega_z [deg/s]');
xlabel('Rate Sensor Temperature Measurement [deg C]');
title('Angular Rate Measurements Vs. Temperature Sampled and Fitted');
ylim([-0.6 0.6])
xlim([-15 60])
% whos
figure
% Your data (zrate) is in discrete groups
histogram(zrate)
figure
plot(sort(zrate))
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