[Octave-bug-tracker] [bug #49794] display vs. disp functions

[Amro]

Follow-up Comment #3, bug #49794 (project octave):

Right, sorry for not being precise.

Basically "display" only shows the variable name if the input is an existing
variable, no name is printed for expressions (not even "ans" as I mistakenly
stated before). This is of course followed by the actual value.

Here's a doc page that further describes disp vs. display:
https://www.mathworks.com/help/matlab/matlab_oop/displaying-objects-in-the-command-window.html

Here are some examples in MATLAB to show the different cases:


>> 1+1
ans =
     2
>> disp(1+1)
     2
>> display(1+1)
     2



>> x=1+1
x =
     2
>> disp(x)
     2
>> display(x)
x =
     2



>> 2
ans =
     2
>> disp(2)
     2
>> display(2)
     2


Note: I use "format compact" by default in MATLAB. This tends to produce less
blank lines as opposed to "format loose". Now Octave have both these format
settings, but it doesn't seem to have an effect on the output, and seems to
always use the compact form. I wanna keep the bug report focused on one issue,
so I'm not too concerned about this aspect here :)

Finally note that "display" in MATLAB has a second *undocumented* input, it
can be used to override the variable name printed. Example:


>> display(1+1, 'myvar')
myvar =
     2
>> display(2, 'myvar')
myvar =
     2
>> display(x, 'myvar')
myvar =
     2



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