r - How to hide selected correlations for corrplot? -

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Trying to see a correlation matrix using corrplot , I'm new to coding and r. But do not want to show all relationship values ​​I want to hide / cancel a portion of selected columns and rows so that an inverted 'L' of values ​​can be shown. For example, see an edited code of the example here:

Enter image details here

Using these columns as indexed, for example 

  M & lt;  cor (mtcars [, - C (1, 3, 6)]]   
 Where we call columns 1, 3, 6 (variable MPG, Disp, cob). In other ways, it will be specified which column should be evaluated  
  mtcars [, c (2: 4, 7)]   
 accounts Let's take you to columns 2, 3, 4 and 7. To get acquainted with coding conventions, see some R tutorials for beginners.

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