Include a second file in a script using logical indexing

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Ross Hanna
Ross Hanna 2018-11-22
评论： Steven Lord 2018-12-3
Hi all
I am creating a script to calculate the NOX output of an IC engine using Pressure Volume data. Unfortunately i cannot show the whole code as it has lots of confidential data from a well known car manufacturer.
In doing so, i have created 3 files, 'Molecular_Analysis_Rich.m', 'Molecular_Analysis_Lean.m' and 'Molecular_Analysis_Stoichiometric.m'. What i am trying to do is call the files into the main script to use the values calculated depending on the value of 'phi'.
I have recently found that logical indexing seems to be much faster than an if statement, so i have been attempting to use that, but i get the follwoing error;
Attempt to execute SCRIPT Molecular_Analysis_Rich as a function:
This is using the following code;
output = cond_rich .* (Molecular_Analysis_Rich)
I believe it is because i have multiple outputs being assigned to a single variable 'output'?
What i am attempting to do is the following but in a more efficient way.
phi = 0.9
cond_rich = phi > 1
cond_stoich = phi == 1
cond_lean = phi < 1
if cond_rich == 1
Molecular_Analysis_Rich
elseif cond_stoich == 1
Molecular_Analysis_Stoichiometric
else cond_lean == 1
Molecular_Analysis_Lean
end
Any help would be appreciated. Thanks

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回答（1 个）

Areej Varamban Kallan
Hi Ross,
Please check if the three '.m ' files you mentioned are functions or not. A MATLAB script can call another MATLAB script only if the latter is a function.
  1 个评论
Steven Lord
Steven Lord 2018-12-3
To be a little more precise, script files neither accept input arguments nor return output arguments. That is one of the primary differences between scripts and functions. [The other somewhat related difference is function workspaces.] See this page for more information.
This line of code:
output = cond_rich .* (Molecular_Analysis_Rich)
will work only if Molecular_Analysis_Rich is a variable or if it is a function that returns at least one output argument.

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