MATLAB: I did not find in the documentation. What is the meaning of set(0,….). What does 0 signify

MATLABset get

I did not find in the documentation. What is the meaning of set(0,….). What does 0 signify? I know that it is the handle? Is the first handle always 0? What does this mean?

Best Answer

The 0 refers to the "root", from where all graphics properties are inherited when a figure is created. By changing the values in the root, all graphics objects that are created will inherit that property, unless otherwise specified, eg:

set(0,'DefaultAxesLineStyleOrder',{'-o',':s','--+'})

The documentation of R2010b states:

The root is a graphics object that corresponds to the computer screen. There is only one root object and it has no parent. The children of the root object are figures.

The root object exists when you start MATLAB; you never have to create it and you cannot destroy it. Use set and get to access the root properties.

On more recent version of MATLAB, the 0 has been replaced by groot .

Related Solutions

MATLAB: Set size of axes in cms

You might just have to try it on a monitor and measure it. I mean, if I took a certain graph and showed it on my laptop and simultaneously on a large monitor in a conference room, they would each be a different size in cm, right? So how is your code supposed to know?

You might look up "DPI-Aware Behavior in MATLAB" in the help:

"Root ScreenSize Property

The ScreenSize property of the root object might not match the display size reported by high-DPI Windows systems. Specifically, the values do not match when the Units property of the root object is set to 'pixels'. MATLAB reports the value of the ScreenSize property based on device-independent pixels, not the size of the actual pixels on the screen."

You might check out groot:

>> groot
ans = 
  Graphics Root with properties:
          CurrentFigure: [0×0 GraphicsPlaceholder]
    ScreenPixelsPerInch: 96
             ScreenSize: [1 1 1920 1080]
       MonitorPositions: [1 1 1920 1080]
                  Units: 'pixels'

MATLAB: Is the GUI stretched on a screen with lower resolution than mine

On your colleague’s machine, the GUI was large because they had “ScreenPixelsPerInch” value equal to 116 instead of 96 (as on your machine).

You can:

1. Either use inches or centimeters as units for your GUI components, since these are fixed units, and do not change regardless of the machine's screen resolution, OR

2. Change the number of pixels per inch on the machine where the GUI is stretched

               >> set(0,'ScreenPixelsPerInch',96)

For more information on the root object (computer screen display) properties, please execute the following at the command line:

   >> web([docroot '/matlab/ref/rootobject_props.html'])

And search for “ScreenPixelsPerInch”.

3. Another idea would be to have units as normalized. The GUI will be to scale for each screen resolution/size, i.e small on your screen, and large, but to scale on your colleague’s.

Best Answer

Related Solutions

MATLAB: Set size of axes in cms

MATLAB: Is the GUI stretched on a screen with lower resolution than mine

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