"Invalid color or line style." Error during plotting in Executable

I am trying to plot a figure with an executable created by "compiler.build.standaloneApplication".

The function I am using is;

function dummyFunction1(a,b)
plot([1 2],[a b]);
end

And the code for executable generation;

appFile = fullfile('D:\testFolder\dummyFunction1.m');
opts    = compiler.build.StandaloneApplicationOptions(appFile,'OutputDir','D:\testFolder');
results = compiler.build.standaloneApplication(opts);

Here is the problem;

Any help would be great.

Answer 1

[Steven Lord]

Read the "Using a MATLAB File You Plan to Deploy" section on this documentation page. Inside your application as you've written it a and b are not the numbers 5 and 8 but the char arrays '5' and '8', and '58' is not a valid color or line style for the plot function (as the error message indicates.) You will need to convert them into numbers before using them in your call to plot.

[Onur]

Hi Steven, thank you. The link helps me to modify the function.

The key point is command prompt takes inputs as a character array.

function dummyFunction1(a,b)

a_double = str2double(a);
b_double = str2double(b);

plot([1 2],[a_double b_double]);

end

[Steven Lord]

You probably want to use the isdeployed function to only convert from string to number in your deployed application, or use the ischar and/or isstring function to only convert if you receive text data as input. If given a number as input the str2double function will return NaN.

str2double(5)

ans = NaN

x = '5';
if ischar(x)
    fprintf("Input data is a char")
    x = str2double(x);
else
    fprintf("Input data is a number")
end

Input data is a char

class(x)

ans = 'double'

x = 8;
if ischar(x)
    fprintf("Input data is a char")
    x = str2double(x);
else
    fprintf("Input data is a number")
end

Input data is a number

class(x)

ans = 'double'

[Onur]

It is realy helpful, thank you.

Answer 2

[GAJENDRA TELI]

you should check the color or line style in dummyFunction1 and change both by some other vlue and then run the program and check the output result.