i have a two dimensional matrix inside a loop i want to save the data matrix inside the loop so that each time the loop runs the data doesn't gets overwritten with the next one what should i do?

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OMKAR ACHARJEE 2018-7-4

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https://ww2.mathworks.cn/matlabcentral/answers/408824-i-have-a-two-dimensional-matrix-inside-a-loop-i-want-to-save-the-data-matrix-inside-the-loop-so-that

关闭： MATLAB Answer Bot 2021-8-20

the value inside the loop is a two dimensional matrix that i need save every time

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Paolo 2018-7-4

编辑：Paolo 2018-7-4

Initialize a cell array of size n, where n is the number of elements you want to save, before your loop, and store the results of your calculations within your loop in the cell array.

Can you show us your code?

OMKAR ACHARJEE 2018-7-4

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here i give you the code

clear all
load trmm;
load index_1;
data = trmm(:,1:10);
rain = data(:,:);
y = index_1(:,:);
for n = 1:size(trmm,2)
dataA=[];
  for i=1:length(rain)
     dataA=[dataA; (data(i,n))];         
  end
dataB=[];
  for i=1:length(rain)-1
     dataB=[dataB; sum(data(i:i+1,n))];         
  end
  dataC=[];
  for i=1:length(rain)-2
     dataC=[dataC; sum(data(i:i+2,n))];         
  end
  dataD=[];
  for i=1:length(rain)-3
     dataD=[dataD; sum(data(i:i+3,n))];         
  end
  dataF=[];
  for i=1:length(rain)-4
     dataF=[dataF; sum(data(i:i+4,n))];         
  end
  dataG=[];
  for i=1:length(rain)-5
     dataG=[dataG; sum(data(i:i+5,n))];         
  end
  dataK=[];
  for i=1:length(rain)-6
     dataK=[dataK; sum(data(i:i+6,n))];         
  end
   dataH=[];
    for i=1:length(rain)-7
       dataH=[dataH; sum(data(i:i+7,n))];         
    end
    dataI=[];
    for i=1:length(rain)-11
       dataI=[dataI; sum(data(i:i+11,n))];         
    end
    dataJ=[];
    for i=1:length(rain)-15
       dataJ=[dataJ; sum(data(i:i+15,n))];         
    end
% % Make padded array.....
M = nan(length(rain),10);
M(1:length(data),1) = dataA;
M(2:length(data),2) = dataB;
M(3:length(data),3) = dataC;
M(4:length(data),4) = dataD;
M(5:length(data),5) = dataF;
M(6:length(data),6) = dataG;
M(7:length(data),7) = dataK;
M(8:length(data),8) = dataH;
M(12:length(data),9) = dataI;
M(16:length(data),10) = dataJ;
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
year=y(:,1);
dataset=[year M];
[years, ~, gg] = unique(dataset(:, 1));
dataset1=[gg M];
MaxC=[];
for i=1:20
for k1 = 2:size(dataset,2)
    maxd = max(dataset(gg==i,k1));
    MaxCol(k1,:) =  maxd;
end
MaxC=[MaxC MaxCol]; 
end
MaxC =(MaxC(2:end,:))';
mm=mean(MaxC,1);
stdev=std(MaxC,1);
recurrence=[2;5;10;25;50;100];
KT=[];
for i=1:length(recurrence)
gumbell_kt(i)=-(sqrt(6))/pi*(0.5772+log(log(recurrence(i)/(recurrence(i)-1))));
end
KT=[KT gumbell_kt];
KT=KT';
dataarrange=[mm' stdev'];
for i=1:length(dataarrange)
    for j=1:length(KT)
        table(i,j)=dataarrange(i,1)+KT(j).*dataarrange(i,2);
    end
end
duration=[3;6;9;12;15;18;21;24;36;48];
for i=1:length(duration)
    for j=1:length(KT)
        intensity(i,j)=table(i,j)./duration(i);
    end
end
plot(duration,intensity(:,1),'bd-',duration,intensity(:,2),'gd-',duration,intensity(:,3),'cd-',duration,intensity(:,4),'kd-',duration,intensity(:,5),'md-',duration,intensity(:,6),'yd-');
end
i want to store the values of intensity and as well as save the resulting plots for every value of n which is the outer loop index and runs from 1 to 10 otherwise the values gets over written... please help me out....

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Answer 1

Jan 2018-7-4

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https://ww2.mathworks.cn/matlabcentral/answers/408824-i-have-a-two-dimensional-matrix-inside-a-loop-i-want-to-save-the-data-matrix-inside-the-loop-so-that#answer_327504

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To store 100 matrices of size 3x4:

n      = 100;
Result = zeros(3, 4, n);
for k = 1:n
  Result(:, :, k) = rand(3, 4);  % Replace rand by your data
end

Or if the matrices have different sizes, use a cell array:

n      = 100;
Result = cell(1, n);
for k = 1:n
  Result{k} = rand(2, k);
end

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Answer 2

Kulan Sinclair 2018-7-4

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https://ww2.mathworks.cn/matlabcentral/answers/408824-i-have-a-two-dimensional-matrix-inside-a-loop-i-want-to-save-the-data-matrix-inside-the-loop-so-that#answer_327505

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you can do it as either a cell array

for i = 1:10
    matrix = rand(10,10);
    matrixcellarray{i} = matrix;
end

or a structure

matrixName = {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j'};
for i = 1:numel(matrixName)
  matrix = rand(10,10);
  matrixStructure.(matrixName{i}) = matrix;
end