Deleting rows with specific values within a matrix

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Lewis Abrams 2021-4-6

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评论： Matt J 2021-5-6

Here is the given question:

Create a matrix, A, of dimension

of random integers in the range

. Now create a new matrix from A by removing any rows that contains either -10, 0, 10.

I have create the random matrix

A = randi([-10, 10], [7,12])

Despite looking online, I am yet to find anything similar.

Thanks for the help.

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Rena Berman 2021-5-6

(Answers Dev) Restored edit

Matt J 2021-5-6

A record of the original question:

Here is the given question:

Create a matrix, A, of dimension of random integers in the range . Now create a new matrix from A by removing any rows that contains either -10, 0, 10.

I have create the random matrix

A = randi([-10, 10], [7,12])

Despite looking online, I am yet to find anything similar.

Thanks for the help.

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回答（1 个）

Matt J 2021-4-6

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https://ww2.mathworks.cn/matlabcentral/answers/794117-deleting-rows-with-specific-values-within-a-matrix#answer_668332

编辑：Matt J 2021-4-6

Hint: do something with this line:

ind = any( A==0 | abs(A)==10 ,2)

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Lewis Abrams 2021-4-6

编辑：Rena Berman 2021-5-6

Thank you Matt, I am relatively new to the software.

What is the purporse of the ind and abs in this line. I have looked up their uses on the MATLAB help section but still need help understaning. I see that running this line allows me to see which rows have one of the factors, and which ones do not.

Using:

A = randi([-10,10], [7,12])
ind = any( A==0 | abs(A)==10 ,2)
out=A(ind,:)

I am able to remove the rows not containing the stated figures. Is there a way to reverse this>

Thanks again.

Matt J 2021-4-6

abs() is absolute value.

c=abs([-10, 10])
c = 1×2
    10    10

The line I've shown you really is by far the hardest part. If you don't know what to do from here, I think you need to review the Matlab on-ramp material.

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