store multiple outputs into one matrix

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C.G.
C.G.2021-10-22
编辑: Chris ,2021-10-22
My code currently produces 14 individual variables (x1-7 and y1-7), I am currently plotting these on a graph using hold on statements.
Is there a way to save these into 2 7x1 doubles, one for x variables and one for y variables so I can just plot these against each other?
file = dir('ATF_0.csv'); %read the files into matlab
num_files = length(file); %record how many files have been found
T = table2array(readtable(file.name)); %read in the values
T = T(T(:,6)<=-0.07,:);
%s1
S1 = T(:,5) >= 0.14 & T(:,5) <= 0.149;
TS1 = T(S1, :);
[y1, idx1] = max(TS1(:, 6));
x1 = TS1(idx1, 5);
%s2
S2 = T(:,5)>= 0.13 & T(:,5) <= 0.139;
TS2 = T(S2, :);
[y2, idx2] = max(TS2(:, 6));
x2 = TS2(idx2, 5);
%s3
S3 = T(:,5)>= 0.121 & T(:,5) <= 0.129;
TS3 = T(S3, :);
[y3, idx3] = max(TS3(:, 6));
x3 = TS3(idx3, 5);
%s4
S4 = T(:,5)>= 0.11 & T(:,5) <= 0.12
TS4 = T(S4, :);
[y4, idx4] = max(TS4(:, 6));
x4 = T(idx4,5);
%s5
S5 = T(:,5)>= 0.1 & T(:,5) <= 0.109
TS5 = T(S5, :);
[y5, idx5] = max(TS5(:, 6));
x5 = TS5(idx5, 5);
%s6
S6 = T(:,5)>= 0.09 & T(:,5) <= 0.099
TS6 = T(S6, :);
[y6, idx6] = max(TS6(:, 6));
x6 = TS6(idx6, 5);
%s7
S7 = T(:,5)>= 0.08 & T(:,5) <= 0.089
TS7 = T(S7, :);
[y7, idx7] = max(TS7(:, 6));
x7 = TS7 (idx7, 5);

回答(1 个)

Chris
Chris 2021-10-22
Arrays with compatible dimensions can be concatenated using either square brackets or the cat() function.
In this case, it looks like your variables are all 1x1 arrays, so:
x = [x1; x2; x3; x4; x5; x6; x7];
would likely be sufficient to create a 7x1.
For a row vector instead of a column vector, use commas instead of semicolons.
  2 个评论
Chris
Chris 2021-10-22
Yes.
You could initialize x as an empty array:
x = []
and inside the for loop, concatenate it to itself.
x = [x; new_x];
another method:
x(end+1) = new_x;
Similarly for y.
I'm not sure whether this entirely answers your question. If you're trying to get x and y columns in the same array, that's also possible:
xy = [];
for ...
xy = [xy; new_x, new_y];

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