hi i started the matlab onramp course and im stuck on this further practice question i wld appreciate if anyone cld help me or even give an hint

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areeb
areeb 2024-8-22
评论： areeb 2024-8-22
  3 个评论
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Image Analyst
Image Analyst 2024-8-22
That is not a question. It's just giving you information. For a demo of that, see the Answer below (scroll down) or show us the actual question.

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采纳的回答

Steven Lord
Steven Lord 2024-8-22
Ran in:
As Image Analyst stated, it's an informational message not a question. Its intent is to let you know that the indices you use to index into an array in MATLAB need not refer to a contiguous section of the array. [They can, but they're not required to.]
x = (1:10).^2 % original array into which you want to index
x = 1x10
1 4 9 16 25 36 49 64 81 100
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contiguous = x([4 5 6]) % a section of x from the middle
contiguous = 1x3
16 25 36
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You can skip elements.
skip = x(1:2:end) % get every other element of x
skip = 1x5
1 9 25 49 81
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You can repeat elements.
repeated = x([3 5 5 7]) % 25 appears twice in the output
repeated = 1x4
9 25 25 49
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You can specify indices that aren't sorted.
unsorted = x([1 4 7 10 2:3:8 3 6 9]) % "shuffle" the elements
unsorted = 1x10
1 16 49 100 4 25 64 9 36 81
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In this last section I used the "skip" pattern as part of generating the unsorted list. I could have done that slightly more compactly by using it for all three sections.
unsorted2 = x([1:3:10 2:3:8 3:3:9]) % "shuffle" the elements
unsorted = 1x10
1 16 49 100 4 25 64 9 36 81
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更多回答（1 个）

Fangjun Jiang
Fangjun Jiang 2024-8-22
Ran in:
density=10:10:100
density = 1x10
10 20 30 40 50 60 70 80 90 100
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index=[1 3 6]
index = 1x3
1 3 6
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SelectedDensityValue=density(index)
SelectedDensityValue = 1x3
10 30 60
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