Saving Answers in For Loop in Matlab

Question

Nihar Jariwala 2021-3-13

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/771463-saving-answers-in-for-loop-in-matlab

回答： Walter Roberson 2021-3-13

Hi Everyone,

I am running one code for all my files I am doing that in a for loop. However, I have a small question:

Question: Suppose I have 8 files in my directory, when I run the code in the foor loop I will get 8 different answers. I wan't to save all those 8 answers as a Matrix. Could someone help me with the same?

Thanks,

Nihar.

clc
clear all
close all
folder = dir('12LPS_G_Fr5.42_X=0_Y=*');
n = length(folder);
Y = [0;10;15;20;25;30;35;5];
for i=1:n;
    load (folder(i).name);
    LT = logical(voltageA>2.5);
    %Converting Leading Tip to Binary
    TT = logical(voltageB>2.5);
    %Converting Trailing Tip to Binary
    LT_C = mean(LT);
    %Void Fraction Leading Tip
    TT_C = mean(TT);
    %Void Fraction Trailing Tip
    z = [];
    for i = 1:n
        z = [z i+rand];
    end

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Answer 1

Walter Roberson 2021-3-13

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/771463-saving-answers-in-for-loop-in-matlab#answer_646738

在 MATLAB Online 中打开

folder = dir('12LPS_G_Fr5.42_X=0_Y=*');
n = length(folder);
Y = [0;10;15;20;25;30;35;5];
all_LT_C = cell(n, 1);
all_TT_C = cell(n, 1);
all_z = zeros(n,n);
for i=1:n
    loaded = load(folder(i).name);
    LT = logical(loaded.voltageA>2.5);
    %Converting Leading Tip to Binary
    TT = logical(loaded.voltageB>2.5);
    %Converting Trailing Tip to Binary
    LT_C = mean(LT);
    %Void Fraction Leading Tip
    TT_C = mean(TT);
    %Void Fraction Trailing Tip
    z = [];
    for i = 1:n
        z = [z i+rand];
    end
    all_LT_C{i} = LT_C;
    all_TT_C{i} = TT_C;
    all_z(i,:) = z;
end

I do not assume here that voltageA or voltageB are vectors, so I do not assume that taking the mean() will give a scalar, or that it will give the same size each time.

You really should be more careful on the mean, as it operates along the first non-singular dimension. If your voltageA was 3 x 1 one time it would give 1 x 1 (okay), and if it were 3 x 2 it would give 1 x 2 (okay), but if it were 1 x 3 then it would give 1 x 1 -- so you cannot predict the number of columns of the result just looking at the number of columns of the input.