I want to get the value of a variable from a table

Question

Philipp Mueller 2016-12-1

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/314919-i-want-to-get-the-value-of-a-variable-from-a-table

评论： Peter Perkins 2016-12-11

Rainflow_Data_Limits_Settings - Copy.txt

As you can see my input is a .txt-File. This .txt-File has several sections for plotting diagrams. One section is my diagram options. I need this variables for formatting my scatter diagram. You can see i store all variables from the section Diagram Options to the variable (table) diagramoptions.

So now to my question: I want to get the value from the variable number_of_plots from the diagramoptions table. How can i do this? Here is my Code and Input-File.

thank you

diagramoptions = [];
diagramlimits = [];
inputdata = [];
diagramoptions2 = [];
diagramlimits2 = [];
inputdata2 = [];
diagramoptions3 = [];
diagramlimits3 = [];
inputdata3 = [];
wholecontent = fileread('Rainflow_Data_Limits_Settings - Copy.txt')
sections = regexp(wholecontent, '\*+([^*]+)\*+([^*]+)', 'tokens')
for section = sections
   switch(strtrim(section{1}{1}))
     % if strcmp(strtrim(section{1}{1}), 'Diagram Options') 
       case 'Diagram Options' %Diagram Options -> siehe meine Gliederung im .txt file
          keyvalues = regexp(section{1}{2}, '([^\n\r=]+)=([^\n\r=]+)', 'tokens')%\n -> new line; \r carriage return
          diagramoptions = cell2table(vertcat(keyvalues{:}), 'VariableNames', {'Key', 'Value'})
     % end    
       case 'Diagram Limits'
          header = strsplit(regexp(section{1}{2}, '[^\n\r]*', 'match', 'once'))
          content = textscan(section{1}{2}, repmat('%f', 1, numel(header)), 'HeaderLines', 2)
          diagramlimits = table(content{:}, 'VariableNames', header)
         case 'Input Data'
            inputdata = cell2mat(textscan(section{1}{2}, '%f%f%f', 'HeaderLines', 1))%dh: ich habe 1 Headerline zur besseren übersicht
         case 'Diagram Options2' %Diagram Options -> siehe meine Gliederung im .txt file
            keyvalues2 = regexp(section{1}{2}, '([^\n\r=]+)=([^\n\r=]+)', 'tokens')%\n -> new line; \r carriage return
            diagramoptions2 = cell2table(vertcat(keyvalues{:}), 'VariableNames', {'Key', 'Value'})
         case 'Diagram Limits2'
            header2 = strsplit(regexp(section{1}{2}, '[^\n\r]*', 'match', 'once'))
            content2 = textscan(section{1}{2}, repmat('%f', 1, numel(header2)), 'HeaderLines', 2)
            diagramlimits2 = table(content2{:}, 'VariableNames', header2)    
         case 'Input Data2'
            inputdata2 = cell2mat(textscan(section{1}{2}, '%f%f%f', 'HeaderLines', 1))%dh: ich habe 1 Headerline zur besseren übersicht
          case 'Diagram Options3' %Diagram Options -> siehe meine Gliederung im .txt file
            keyvalues3 = regexp(section{1}{2}, '([^\n\r=]+)=([^\n\r=]+)', 'tokens')%\n -> new line; \r carriage return
            diagramoptions3 = cell2table(vertcat(keyvalues{:}), 'VariableNames', {'Key', 'Value'})
         case 'Diagram Limits3'
            header3 = strsplit(regexp(section{1}{2}, '[^\n\r]*', 'match', 'once'))
            content3 = textscan(section{1}{2}, repmat('%f', 1, numel(header3)), 'HeaderLines', 2)
            diagramlimits3 = table(content3{:}, 'VariableNames', header3)
         case 'Input Data3'
            inputdata3 = cell2mat(textscan(section{1}{2}, '%f%f%f', 'HeaderLines', 1))%dh: ich habe 1 Headerline zur besseren übersicht
        otherwise
            warning('Unknown section: %s', section{1}{1})
     end
  end
%öffnet die output fenster
openvar diagramoptions
openvar diagramlimits 
openvar inputdata 
openvar diagramoptions2
openvar diagramlimits2
openvar inputdata2 
openvar diagramoptions3
openvar diagramlimits3 
openvar inputdata3

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Answer 1

Peter Perkins 2016-12-2

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/314919-i-want-to-get-the-value-of-a-variable-from-a-table#answer_245747

在 MATLAB Online 中打开

Phillipp, I'm not exactly sure what you're aksing to do, but in general if you have a table named diagramoptions containing a variable named number_of_plots, then

diagramoptions.number_of_plots

returns the entire variable as (probably) a vector in whatever its "native" type is, and

diagramoptions.number_of_plots(5)

returns the 5th element of that variable. This is described in the doc .

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Philipp Mueller 2016-12-9

thank you for your support. but it does not work so far. -> if i use your command i get this Error using table/dotParenReference (line 52) Unrecognized variable name 'number_of_plots'.

Peter Perkins 2016-12-11

Then apparently your table doesn't have a variable with that name. The documentation is pretty thorough on table subscripting, that's the place to start.

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