How to use splitapply function to find a mean value for part of plot ?

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Ilkin Abdullayev
Ilkin Abdullayev 2020-5-15
评论： Ilkin Abdullayev 2020-5-19
Hello Everyone,
I am in trouble with splitapply function. It is a bit difficult to describe here but I will try.
I have upload picture and as it is specified in the picture with the horizontal red lines, i have separated my whole circle into the section with 4 cm distance.
Now, what I want to do, in each section I have load value and I need a mean value for each section.
I think by using the splitapply we can split the whole data into the section with 4 cm each but do not how to do.
If you have any suggestion to do this beside splitapply please let me know.
I have a different colours for load and after finding the mean load value for each section based on my color scale, I will have a kind of bar graph with different colors in each section - This parts is just to explain that what is my main target.
If someone can help I really appreciate. I hope my question is clear.
Thanks

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回答（1 个）

darova
darova 2020-5-15
try round
y1 = round(y-min(y))+1; % make all yy values 1 2 3 4 ...
n = max(y1); % highest number
a = zeros(n,1); % preallocate mean value
m = zeros(n,1); % preallocate number of values in section
for i = 1:numel(y1)
i1 = y1(i);
m(i1) = m(i1) + 1; % increase number of values
a(i1) = a(i1) + val(i1); % sum values
end
a = a./m;
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darova
darova 2020-5-18
I see that your data is splitted in [-4 -3 ... 3 4] sections. So i just rounded all your data such that all values of green points [1 2 ... 7 8]
Example. I want to split data (circle radius 3) in section of 0.5 size. So i replaced data to 'zero' point and multiplied by 2 , rounded and divided by 2. Finally moved to origin
[x,y] = pol2cart(0:.1:2*pi,3);
y1 = round( (y-min(y))*2 )/2 + min(y);
plot(x,y,'.-r')
hold on
plot(x,y1,'ob')
hold off
axis equal

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