How can I plot scatter graphs in a for loop?

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Lala0099
Lala0099 2019-11-11
评论： Rik 2022-4-8
I have a large data set. I am trying to use a for lop, to be able to select which coloumn i want to keep and which ones i want to discard, all depending on the user input.
I managed to do that part, i believe.
Now I am trying to get an average value for each coloumn and plot the results in a scatter graph. I tried to do this using a for loop.
But there is only one data set that appears on my scatter graph, so I assume it cancels the ones that were before that last point. I used hol all, hold on and draw now, but could not get it to work. Also I would like add a line of best fit for the scatter graph for each data set and save slope and intercept numbers in a table.
I managed to do do the line of best fit and slope, intercept before, but not since I am trying to use for loops, so I put my old code segments in a comented out section.
In the first version of the code, i just determined the coloumns ( channels ) i want to use in the code, not depending on user input.
I cannot upload the excel file that I use, because it is too big. i tried to compress, but did not work

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回答（1 个）

David Hill
David Hill 2019-11-11
Assume you have your data in a matrix, M. Assume you want a scatter plot of the column vs. mean of each column.
scatter(1:size(M,2),mean(M));
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Helder Maranhão
Helder Maranhão 2022-3-29
编辑：Rik 2022-4-8
Hi. I think understand the question. I have the same issue.
Imagine that you have a for loop
n=1
for k=1:20
y=n+1
n=n+1
end
scatter(k,y)
So imagine that you want to plot the y for each k from 1 to 20.
But in Matlab it will appear the last value for k.
How can we plot k from 1 to 20?
Could someone help?
Thank you
Rik
Rik 2022-4-8
@Helder Maranhão your code overwrites the value of each parameter every iteration. You should learn to use arrays.

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