How to create a function that do not require all the input paramenters

Question

Ricardo Duarte 2020-11-1

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关闭： MATLAB Answer Bot 2021-8-20

Dear all,

I'm quite new using matlab and I'm trying to create a function with +- 30 input parameters. Then, when I call the function, in some cases, I don't need to use all input parameters.

According to this I would like to know if its possible to create a function with 30 input parameters but when using it, just use a few according to the need of the user.

I don't want to put [] in the parameters that I'm not using. I was thinking of somethins like : Test = funct('a', a, 'c', c); However, I have one of the input parameter requires a matrix and when I'm introducing the matrix I get an error.

Thank you in advance,

Ricardo

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Answer 1

Ameer Hamza 2020-11-1

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The correct way to do this is to use an input parser object and define some inputs as optional: https://www.mathworks.com/help/matlab/ref/inputparser.html. The documentation example shows how it can be done.

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Ricardo Duarte 2020-11-1

在 MATLAB Online 中打开

I'm doing this to create the function:

function writeh5filetotal(varargin)
T=0;
%[H5file]=file_new;
file_new='teste.h5'; 
format_version=[]; 
author=[]; 
institution=[];
country_code=[];
contact=[];
start_date=[];
end_date=[];
date_of_creation=[];
purpose=[];
data_uuid=[];
data_type=[];
comments=[];
expsetup=[];
recorder_manufacturer=[];
recorder_serial_number=[];
recorder_model=[];
builtin_hydrophone=[];
hydrophone_manufacturer=[];
hydrophone_sensitivity=[];
hydrophone_serial_number=[];
hydrophone_model=[];
calibration_frequency_count=[];
calibration_datetime=[];
calibration_factor=[];
calibration_procedure=[];
reference_frequencies=[];
ais_database=[];
source_levels=[];
bathymetry_database=[];
temperature_database=[];
salinity_database=[];
sound_speed_profile_model=[];
propagation_model=[];
numeric_data_calibration=[];
hydrophone_count=[];
total_number_of_grid_points=[];
longitude=[];
latitude=[];
depth=[];
frequency_count=[];
frequency_band_definition=[];
frequency=[];
time_duty_on=[];
time_duty_off=[];
time=[0];
averaging_time=[];
spl_values=[];
percentile_count=[];
percentile_list=[];
percentile=[];
for opt=1:nargin
    switch varargin{opt}
        case 'file_new'
            file_new=varargin{opt+1};
            %file_new=file_new;
        case 'format_version'
            format_version=varargin{opt+1};
            %format_version=format_version;
        case 'author'
            author=varargin{opt+1};
        case 'institution'
            institution=varargin{opt+1};
        case 'country_code'
            country_code=varargin{opt+1};
         ...
    end
end
....

However if one of those cases is a matrix I will obtain an error:
 "SWITCH expression must be a scalar or a character vector"

Ameer Hamza 2020-11-1

This will be a complicated approach. I suggest you follow input parser approach as given in the link in my answer. It may be difficult to understand initially, but once it is working, it will be much more robust.

John D'Errico 2020-11-1

Ugh. I STRONGLY recommend you follow the advice given by Ameer.

How to create a function that do not require all the input paramenters

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