How to plot a smooth curve while data point order is messed up

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MJ
MJ 2022-11-23
评论： Image Analyst 2022-11-23
First thanks for spending your precious time on my question.
I have a data set in a double, for example:
0.141176470588235 87.0369747899159
0.403235294117645 258.710588235294
0.354117647058822 230.757647058823
0.329117647058822 207.584537815126
0.297647058823528 184
0.244411764705881 159.604705882352
0.216176470588234 141.458823529411
0.216176470588234 119.623529411764
Countinous data..
16.0094117647058 240.645133689839
16.9411764705882 224.443208556149
17.5341176470588 213.138823529411 (n-1 th data point)
0.60000000000000 326.800000000000 (n th data points)
as you can see the order is messed up, and plotted curve looks messed up as well..
For example, the curve connects n th data points and n-1 th data point, making a kind of loop
I can easily re-order them but the problem is these data points were imported from excel spreadsheet and needs lots of time to separate them.
So I just decided to import whole spreadsheet, upto 102 columns with many blanks (recorded as NaN).
What would be the best way to plot it?

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采纳的回答

Voss
Voss 2022-11-23
编辑：Voss 2022-11-23
Ran in:
Some random data:
data = randn(10,2)
data = 10×2
-1.0678 -1.5150 -0.5278 -0.0481 0.5504 -0.7380 0.2118 -0.7771 -1.1406 -0.6477 2.1720 0.2623 1.5867 -0.3605 -1.8863 0.3281 0.2803 0.4477 0.3407 0.8607
Sort on the first column:
[~,idx] = sort(data(:,1));
data = data(idx,:)
data = 10×2
-1.8863 0.3281 -1.1406 -0.6477 -1.0678 -1.5150 -0.5278 -0.0481 0.2118 -0.7771 0.2803 0.4477 0.3407 0.8607 0.5504 -0.7380 1.5867 -0.3605 2.1720 0.2623
Then plot with the new data.
  2 个评论
MJ
MJ 2022-11-23
I truly appreciate you Voss!
You definitely saved my time.
I wish you a great day.
Image Analyst
Image Analyst 2022-11-23
@MJ I was also going to suggest sorting. So if this solves the question for you then please click the "Accept this answer" link to award @Voss "reputation points" for the answer. Thanks in advance. 🙂

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