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

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Joseph Salerno
Joseph Salerno 2018-9-15
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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回答（1 个）

Image Analyst
Image Analyst 2018-9-15
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)

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