Include a second file in a script using logical indexing

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

Answer 1

[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.

[Steven Lord]

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.