A question about the declaration of public properties in apps

Hi! :)

I have a question: if I have declared a property as a public variable in my main app, is it necessary that I also declare it as a private property in the app I am using it.

In my case I have a table Osmotisk_data that I have declared as a public property in the main app, then I am using some of the columns (arrays) from this table in another app, there I have declared it as a private property, but I am a little confused becuase I am not getting the results that I am supposed to get.

Answer 1

[Steven Lord]

How are you planning to share the data between the two apps? This documentation page offers some guidance on how to do that.

[Muazma Ali]

I didn't understand your question: isnt the data automatically shared when I declare the variable as public in the main app..?

[Steven Lord]

Anyone with access to the app object has access to its public properties. But are you giving that second app access to that first app object?

As a non-app example, I'll create a variable R. Don't worry too much about the details of what it is. What's important is that it's an object.

R = RandStream.create('mt19937ar');

It has properties that I can get since I have access to the object.

p = properties(R)

p = 9x1 cell array
    {'Type'           }
    {'Seed'           }
    {'NumStreams'     }
    {'StreamIndex'    }
    {'State'          }
    {'Substream'      }
    {'NormalTransform'}
    {'Antithetic'     }
    {'FullPrecision'  }

S = R.Seed

S = uint32
0

But if I call a function and don't give it the object, it can't ask for properties of the object even though they're public. It has no idea what R is, even though it exists in the calling workspace. It didn't get passed into the myfun workspace.

myfun() % will error, doesn't know what R is

Inside function myfun, trying to get the Seed property from R

Unable to resolve the name 'R.Seed'.

Error in solution>myfun (line 7)
y = R.Seed; % will error

function myfun
disp("Inside function myfun, trying to get the Seed property from R")
y = R.Seed; % will error
end

That documentation page I linked to gives some guidance about how to make the first app object accessible to the second app.