Write a function named custom_blocks

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Siddharth Varshney 2021-12-6

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回答： Vaibhav 2024-6-3

Write a function named custom_blocks that takes an n-by-m

matrix as an input argument (the function does not have to check the format

of the input) and returns a 2n-by-2m matrix as an output argument. The upper

left n-by-m sub matrix of the output matrix is the same as the input matrix.

The elements of the upper right n-by-m sub matrix are twice as large as

the corresponding elements of the input matrix. Similarly, the lower left submatrix

is the input matrix multiplied by three and the lower right n-by-m submatrix

is four times the input matrix. For example, here is an example run:

>> custom_blocks([1:3;3:-1:1])

ans =

1 2 3 2 4 6

3 2 1 6 4 2

3 6 9 4 8 12

9 6 3 12 8 4

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Walter Roberson 2021-12-7

The problem does not pass in the values of m and n . The problem passes in a matrix with a particular number of rows and a particular number of columns. If you call the number of rows received n, and the number of columns received m, then the number of rows out must be 2*n and the number of columns out must be 2*m -- that is, the output must have twice as many rows as the input, and twice as many columns as the input.

Stephen23 2021-12-10

https://web.archive.org/save/https://www.mathworks.com/matlabcentral/answers/1604015-write-a-function-named-custom_blocks

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回答（2 个）

Voss 2021-12-7

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function out = custom_blocks(in)
    out = [in 2*in; 3*in 4*in];
end

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Walter Roberson 2021-12-8

The experience of the long-time volunteers is that it is most often better to guide students into how to read questions, and how to find resources, rather than to give them exact solutions to problems. In cases where specific code is useful, it is our experience that is often better to give code for a different question that uses the same principles, so that the student at least has to recognize the principles.