Renaming loaded variable with initially unknown name

Question

Pratyay Sengupta 2021-3-30

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/788354-renaming-loaded-variable-with-initially-unknown-name

评论： Stephen23 2021-3-31

Hello All,

Currently I am working with genome scale models. So, I have .mat files of those models. After loading the files, I get random variables (suppose: xyz, data type: 1x1 struct) in my workspace. I want to fetch variables inside the loaded variable. Like xyz.reactions or xyz.genes. But I am unable to get the name 'xyz'. How can I rename them automaically without knowing the variable names?

I tried > model = load('filename.mat'); but this creates a struct with the unknown name inside model, so unable to fetch variables in it.

Any suggestions would be highly appreciated!

Thanks!

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Stephen23 2021-3-31

"Any suggestions would be highly appreciated!"

https://www.mathworks.com/help/matlab/ref/fieldnames.html

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Answer 1

Steven Lord 2021-3-30

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/788354-renaming-loaded-variable-with-initially-unknown-name#answer_662879

在 MATLAB Online 中打开

data = load('census.mat')
data = struct with fields:
    cdate: [21×1 double]
      pop: [21×1 double]
variableNames = fieldnames(data)
variableNames = 2×1 cell array
    {'cdate'}
    {'pop'  }
dataFromVariable1 = data.(variableNames{1})
dataFromVariable1 = 21×1
        1790
        1800
        1810
        1820
        1830
        1840
        1850
        1860
        1870
        1880
fprintf('Variable %s from census.mat is %s\n', variableNames{1}, mat2str(dataFromVariable1))
Variable cdate from census.mat is [1790;1800;1810;1820;1830;1840;1850;1860;1870;1880;1890;1900;1910;1920;1930;1940;1950;1960;1970;1980;1990]