Why is the length of these two variables are different?

Question

Leon 2019-10-17

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/485980-why-is-the-length-of-these-two-variables-are-different

评论： Leon 2019-10-17

采纳的回答： Walter Roberson

test.mat

在 MATLAB Online 中打开

I use the same number c to set the length of these two variables A (numerical) and B (string).

Why are their lengths are different at Station 3? Weird enough, if I only run Station 3, their length will be the same.

Here is my code and attached is the data.

clear all
close all
clc
%% --- load the file ---
load('test.mat'); % Sta
% Initialize each column:
ACCESSION = [];
CTDTEMP_ITS90_DEG_C = [];
for i=1:3 %length(Sta)
    
    c = length(Sta{i}.depth); % number of depths
    
    disp(['Number of depth levels:', num2str(c)]);
    
    % Accession:
    if isfield(Sta{i}, 'accession') == 1
        [ACCN{1:c}] = deal(Sta{i}.accession);
    else
        [ACCN{1:c}] = deal('N/A');
    end
    B = ACCN';
    ACCESSION = [ACCESSION; B];
    disp(['length Accession:', num2str(length(B))])
    
    %CTDTMP:
    A = [];
    if isfield(Sta{i}, 'ctdtmp') == 1
        A = Sta{i}.ctdtmp;
    else
        A = -999*ones(c,1)
    end
    CTDTEMP_ITS90_DEG_C = [CTDTEMP_ITS90_DEG_C; A];
    
    disp(['length of CTDTMP:', num2str(length(A))])
    
end

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Answer 1

Walter Roberson 2019-10-17

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/485980-why-is-the-length-of-these-two-variables-are-different#answer_396904

You do not truncate ACCN down to length c. ACCN had been 11 long because of the previous iterations; now only 10 are needed but you set ACCN{1:10} which does not remove the unneeded ACCN{11}