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If I execute MatrixPlot@IdentityMatrix@100, the result is a good size. However, if I evaluate

Grid[{{200!}, {MatrixPlot@IdentityMatrix@100}}, ItemSize -> Automatic]

the MatrixPlot is much smaller, even when the page is wide. How can I make the MatrixPlot appear at its original size in the Grid? I'd prefer not to hard-code the size.

this picture

The picture shows that the second MatrixPlot is too small.

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    $\begingroup$ Automatic != Automatic so why not just use ImageSize for MatrixPlot? $\endgroup$
    – Kuba
    Commented Oct 25, 2013 at 6:19

2 Answers 2

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If you set ImageSizeMultipliers -> 1 then the graphics will not be downsized when appear inside list-like constructs:

Style[
     Grid[{{200!}, {MatrixPlot@IdentityMatrix@100}}, ItemSize -> Automatic],   
     ImageSizeMultipliers -> 1]

Alternatively,

Grid[{{200!}, {MatrixPlot@IdentityMatrix@100}}, ItemSize -> Automatic,
  BaseStyle -> ImageSizeMultipliers -> 1]

or

Grid[{{200!}, {MatrixPlot@IdentityMatrix@100}}, ItemSize -> Automatic,
  ItemStyle -> ImageSizeMultipliers -> 1]

give the same output.

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Although he puts it somewhat obliquely, Kuba is giving you good advice in his comment. When you place a graphics object into a Grid or Column construct and care even a little about its size, explicitly make the setting of the ImageSize option in the graphics object.

notebook.png

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