How to convert a cell array to a double or numeric number and conserve only the needed numeric values?

Question

Kouemo Ivan Steve 2018-8-11

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/414522-how-to-convert-a-cell-array-to-a-double-or-numeric-number-and-conserve-only-the-needed-numeric-value

回答： GK 2018-9-3

Hello together,

i please need your support concerning one problem, that i face to since 3 hours already :-(. It concern a sensor data processing. My cell look like:

_ *contenuText = 4×3 cell array
{'SensorName'} {'Temperature'} {'Pressure'   }
{'Sensor1'   } {'temp 40'    } {'500.000mBar'}
{'Sensor1'   } {'temp 40'    } {'500.000mBar'}
{'Sensor1'   } {'temp 40'    } {'250.000mBar'}*_
for k = 1:length(Pression)
  tmpStr  = strsplit( Pression{k}, {':','.'} )
  tmpStrT = strsplit( Temperature{k}, {':',' '} )
  if ~strcmp( tmpStr{k},'')
    tmp = str2num(separationStr{k})
  end
end

Thanks for your support.

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

dpb 2018-8-12

Where do these data come from? If the original data are from a file, could read the file directly; if it's from a serial interface or some other form, knowing that would help, too.

The better solution may be to get the data into a better form earlier rather than parsing the cell array as you have here (altho that's certinly do-able; may be more trouble than is needed).

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

GK 2018-9-3

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/414522-how-to-convert-a-cell-array-to-a-double-or-numeric-number-and-conserve-only-the-needed-numeric-value#answer_335170

在 MATLAB Online 中打开

Hello, you can use textscan() to separate string and numeric vales.

textscan()

Use '%s' string and '%f' to separate string and numeric values respectively.

    Example 1: Read each column of a text file.
        Suppose the text file 'mydata.dat' contains the following:
            Sally Level1 12.34 45 1.23e10 inf Nan Yes 5.1+3i
            Joe   Level2 23.54 60 9e19 -inf  0.001 No 2.2-.5i
            Bill  Level3 34.90 12 2e5   10  100   No 3.1+.1i
        Read the file:
            fid = fopen('mydata.dat');
            C = textscan(fid, '%s%s%f32%d8%u%f%f%s%f');
            fclose(fid);
        textscan returns a 1-by-9 cell array C with the following cells:
            C{1} = {'Sally','Joe','Bill'}            %class cell
            C{2} = {'Level1'; 'Level2'; 'Level3'}    %class cell
            C{3} = [12.34;23.54;34.9]                %class single
            C{4} = [45;60;12]                        %class int8
            C{5} = [4294967295; 4294967295; 200000]  %class uint32
            C{6} = [Inf;-Inf;10]                     %class double
            C{7} = [NaN;0.001;100]                   %class double 
            C{8} = {'Yes','No','No'}                 %class cell
            C{9} = [5.1+3.0i; 2.2-0.5i; 3.1+0.1i]    %class double