Extracting Data from Cells

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Devrim Tugberk
Devrim Tugberk 2019-7-19
编辑： Franklin 2022-4-15
Dear Matlab users,
I am facing some trouble extracting data from a cell. I attached the a screenshots showing what my cell looks like (cells within a cell). Each cell in the "big" cell has xyz data and i would like to extract each column representing the respective coordinates as column vectors.
My explanation might have been confusing so i will try summarize: Extract the "minor" cells from the main cell, extract the xyz from each minor cell as column vectors.
Thank you for the help
Capture.JPG
Capture_1.JPG
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Adam Danz
Adam Danz 2019-7-19
I interpreted it as an indexing question.
Devrim Tugberk
Devrim Tugberk 2019-7-19
My goal was the "extract" the xyz coordinates as column vectors and plot them using scatter3()

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采纳的回答

madhan ravi
madhan ravi 2019-7-19
编辑：madhan ravi 2019-7-19
vv=cellfun(@(x) x(:,1:3),cross_sections,'un',0); % assuming the first three columns in each cell represents x,y & z
v=cat(1,vv{:}); % gathering x,y, & z of each cell into one matrix
scatter3(v(:,1),v(:,2),v(:,3))
% x -^ ^- y ^- z
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Devrim Tugberk
Devrim Tugberk 2019-7-19
One last tiny tweak, is there a way I could supress the scatter3 function so it doesnt spit out 138 figures? Maybe just give me 138 tables or vectors or something which i can refer back to and plot the desired one only?
madhan ravi
madhan ravi 2019-7-19
Then for instance:
scatter3(vv{2}(:,1),vv{2}(:,2),vv{2}(:,3))

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更多回答（2 个）

Adam Danz
Adam Danz 2019-7-19
编辑：Adam Danz 2019-7-19
I think this is the format of your data:
C = {rand(20,4),rand(15,4),rand(22,4)};
Extract the first 3 columns of cell 2
C{2}(:,1:3)
Extract column 2 of cell 3
C{3}(:,2)
Extract the entire matrix from cell 1
C{1}
Extract the entire matrix from cell 1 but reorganize it into a single column
C{1}(:)
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Adam Danz
Adam Danz 2019-7-19
编辑：Adam Danz 2019-7-19
"My goal was the "extract" the xyz coordinates as column vectors and plot them using scatter3()"; " I need to have 3 column vectors for each cell"
@ Devrim Check out the 2nd block of code in my answer. It does what you're describing. If you want to perform that block on all cells,
c3 = cellfun(@(x)x(:,1:3), C, 'UniformOutput', false)

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Guillaume
Guillaume 2019-7-19
编辑：Guillaume 2019-7-19
If you want to create a scatter3 plot using the coordinates from all the cells of Cross_sections, this is how I'd go about it:
allsections = vertcat(Cross_sections{:});
scatter3(allsections(:, 1), allsections(:, 2), allsections(:, 3));
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Guillaume
Guillaume 2019-7-19
Indeed! Otherwise, the operation does nothing.
Franklin
Franklin 2022-4-15
编辑：Franklin 2022-4-15
Hello All;
I have a 70x1 cell data called info. Inside info is the 1x1 struct, each with 2 variables A and B. index 1.A and 1.B have a size(827x1) while all others 2.A or 2.B...70 are 1348x1.
Am able to extract some portions of "info" e.g. Y_1...Y_5 which I would use for my Y axis on the plot
Q1. How do I plot test1 (Y axis) against X_2(X Axis) without array errors e.g. Arrays have incompatible sizes for this operation.
Q2. How do I get Yall using a Loop or any faster method
Code:
Y_2 = info{2}(:,1).B; % Get Cell 2B data i.e. 1348x1 double
Y_3 = info{3}(:,1).B; % Get Cell 3B data i.e. 1348x1 double
Y_4 = info{4}(:,1).B; % Get Cell 4B data i.e. 1348x1 double
Y_5 = info{5}(:,1).B; % Get Cell 5B data i.e. 1348x1 double
X_1 = info{1}(:,1).A; % Get Cell 1A data i.e. 827x1 double
X_2 = info{5}(:,1).A; % Get Cell 5A data i.e. 1348x1 double
Yall = Y_2...Y_70; % Get all Y values using a loop
test1 = Yall./X_1;
figure(2)
plot(X_2,test1);hold on;
figure(3)
plot(X_1,test1);hold on;

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