Undefined operator '-' for input arguments of type 'cell'.

Question

Joseph Salerno 2018-9-15

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/419178-undefined-operator-for-input-arguments-of-type-cell

回答： Image Analyst 2018-9-15

I'm trying to input columns of data from a cell into an equation, with the hopes of it outputting multiple answers, one for each row. I've tried replacing parentheses with curly braces and using excessive parenthesis, but I can't figure it out. I'm entirely new to programming and matlab, so please go easy on me.

>> Data={'Helium','He',.0341,.0237;'Hydrogen','H2',.244,.0266;'Oxygen','O2',1.36,.0318;'Chlorine','Cl2',6.49,.0562;'Carbon dioxide','CO2',3.59,.0427}
Data =
  5×4 cell array
    {'Helium'        }    {'He' }    {[0.0341]}    {[0.0237]}
    {'Hydrogen'      }    {'H2' }    {[0.2440]}    {[0.0266]}
    {'Oxygen'        }    {'O2' }    {[1.3600]}    {[0.0318]}
    {'Chlorine'      }    {'Cl2'}    {[6.4900]}    {[0.0562]}
    {'Carbon dioxide'}    {'CO2'}    {[3.5900]}    {[0.0427]}
>> Pressure=((.08206*300)/(20-{Data{:,4}}))-{Data{:,3}}/(20^2)

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Answer 1

Image Analyst 2018-9-15

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/419178-undefined-operator-for-input-arguments-of-type-cell#answer_336989

在 MATLAB Online 中打开

Try this:

Data={'Helium','He',.0341,.0237;'Hydrogen','H2',.244,.0266;'Oxygen','O2',1.36,.0318;'Chlorine','Cl2',6.49,.0562;'Carbon dioxide','CO2',3.59,.0427}
%   Data =
%     5×4 cell array
%       {'Helium'        }    {'He' }    {[0.0341]}    {[0.0237]}
%       {'Hydrogen'      }    {'H2' }    {[0.2440]}    {[0.0266]}
%       {'Oxygen'        }    {'O2' }    {[1.3600]}    {[0.0318]}
%       {'Chlorine'      }    {'Cl2'}    {[6.4900]}    {[0.0562]}
%       {'Carbon dioxide'}    {'CO2'}    {[3.5900]}    {[0.0427]}
column3 = cell2mat(Data(:, 3))
column4 = cell2mat(Data(:, 4))
Pressure = ((.08206*300) ./ (20-column4)) - column3 ./ (20^2)