how add intensity/frequency to the scatter plot

2018 3 6
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更新时间：2018 3 7
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Hi, I would like to scatter plot these two vectors: X=[0 0 1 2 0 1 1 0]; Y=[1 1 1 1 2 0 0 2]; and had the frequency of occurrence in the color or in the size of the points, something like the attached pic

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Pawel Jastrzebski
编辑：Pawel Jastrzebski 2018-3-6

0 个投票

Consider the code below but also check the documentation for:
X=[0 0 1 2 0 1 1 0];
Y=[1 1 1 1 2 0 0 2];
% find the freqency vector
minVal = min(Y)
maxVal = max(Y)
vectorOfvalues = minVal:maxVal
howMany = Y'==vectorOfvalues
howManySum = sum(howMany);
% this line nicely show how the occurance of a value
% 1st row: value
% 2nd row: occurance
howManySum = [vectorOfvalues; howManySum]
% pre-allocation
occurence = zeros(1,length(Y));
for i=1:length(howManySum)
occurence(Y==howManySum(1,i)) = howManySum(2,i);
end
Y
occurence
% I've added the factor of 50 for the occurance
% so the diffrence between the dot sizes is visible
figure
scatter(X,Y,50*occurence)

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didi
didi 2018-3-6
Hi! thansk for your answer, but I got an error here: howMany = Y'==vectorOfvalues matrix dimensions must agree
  • IF you literally copied/pasted my code - it should work (see attached live script and the .pdf)
  • This error appears when you're trying to compare to row vectors or two column vectors - make sure one of the vector is in column orientation and the other one in the row orientation - see example below
  • Try clearing the workspace of the variables that you use within this code - make sure that whatever is created with the code, is created for the first time
>> Y
Y =
1 1 1 1 2 0 0 2
>> vectorOfvalues
vectorOfvalues =
0 1 2
>> howMany = Y ==vectorOfvalues
Matrix dimensions must agree.
>> Y = Y'
Y =
1
1
1
1
2
0
0
2
>> howMany = Y ==vectorOfvalues
howMany =
8×3 logical array
0 1 0
0 1 0
0 1 0
0 1 0
0 0 1
1 0 0
1 0 0
0 0 1
didi
didi 2018-3-7
Thanks for the your help. I still have the == problem but i solved in this way:
howMany1 = Y'==vectorOfvalues(1) howMany2 = Y'==vectorOfvalues(2) howMany3 = Y'==vectorOfvalues(3) howMany = [howMany1 howMany2 howMany3]
Which version of Matlab do you use?
didi
didi 2018-3-7
R2015a..indeed maybe it can be related to the version
Must be. The code:
howMany = Y'==vectorOfvalues
uses so called implicit expansion which was introduced in version R2016B.

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