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How can I show the ranges in the graph of a function?

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HUST Student
HUST Student 2015-10-29
评论： HUST Student 2015-10-29
I must shou (-0,8; 0,8)
  2 个评论
Walter Roberson
Walter Roberson 2015-10-29
Do you mean you need to draw vertical lines at -0.8 and +0.8 ?
HUST Student
HUST Student 2015-10-29
编辑：HUST Student 2015-10-29
I wanted to point out this interval (-0.8, 0.8) in the graph of the function changing the line texture, for example to dashed - - - -
if it is not possible point out range in this way. X can be placed at the beginning and end of the interval on the graph of the function

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回答（1 个）

Walter Roberson
Walter Roberson 2015-10-29
To change a line texture part way through a line, you need to draw a different line for each part that has a different texture. For example,
idx1 = find(x < -0.8);
idx2 = find(-0.8 <= x & x <= 0.8);
idx3 = find(0.8 < x);
idx1t = [idx1(:); idx2(1)];
idx2t = idx2;
idx3t = [idx2(:); idx3(1)];
plot( x([idx1t), y(idxt), '-');
hold on
plot(x(idx2t), y(idx2t), '--');
plot(x(idx3t), y(idx3t), '-');
The extra work with the *t variables is to allow the segments to join up.
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