short programs to subtracts rows from a matrix of n length

Question

Tino 2019-4-22

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/457769-short-programs-to-subtracts-rows-from-a-matrix-of-n-length

评论： Tino 2019-4-22

Hi,

Please kindly help me with a short program that can do this computation using T.length and X.length. Please find my computation in matlab below and the instruction on every step.

Thanks in advance

Jonathan

The final computation answer is also given

T= [5.1000 3.5000 1.4000 0.2000;

6.4000 3.2000 4.5000 1.5000;

5.4000 3.4000 1.7000 0.2000;

5.7000 2.8000 4.5000 1.3000;

5.7000 4.4000 1.5000 0.4000;

5.6000 2.9000 3.6000 1.3000];

X = [

5.1000 3.8000 1.9000 0.4000;

6.4000 2.9000 4.3000 1.3000;

4.3000 3.0000 1.1000 0.1000;

5.4000 3.0000 4.5000 1.5000];

Z1 = T - X (1, :);

Z2 = T - X(2,:);

Z3 = T - X(3,:);

Z4 = T - X (4,:);

% get the square of each rows%

Z1 = (Z1.^ 2);

Z2 = (Z2.^2);

Z3 = (Z3.^2);

Z = (Z4.^2);

% get the sum of each matrices %

Z1 = sum(Z1, 2);

Z2 = sum(Z2, 2);

Z3 = sum(Z3, 2);

Z4 = sum(Z4, 2);

% get the square root of the numbers in each matrices to get the

% distance%

Z1 = sqrt(Z1);

Z2 = sqrt(Z2);

Z3 = sqrt(Z3);

Z4 = sqrt(Z4);

Answers from the computation below

Z1 =

0.6164

3.1654

0.5745

2.9883

0.9381

2.1817

Z2=

3.4161

0.4123

3.0364

0.7348

3.3749

1.0630

Z3=

0.9950

4.2391

1.3191

3.8730

2.0421

3.0643

Z4 =

3.4117

1.0198

3.1129

0.4123

3.5014

0.9487

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madhan ravi 2019-4-22

What is your question?

Tino 2019-4-22

Hi Madhan thanks for your response.

I just want a shorter code to do the computation above using any 2 matrices with varying length

T = T.length

X = X.length

Please get back to me if you need clarification

thanks in advance

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Answer 1

Andrei Bobrov 2019-4-22

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https://ww2.mathworks.cn/matlabcentral/answers/457769-short-programs-to-subtracts-rows-from-a-matrix-of-n-length#answer_371658

Z = squeeze(sqrt(sum((T - permute(X,[3,2,1])).^2,2)));

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Tino 2019-4-22

Thanks Andrei

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