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POmatlab: sorting and random
 

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  1. POmatlab: sorting and random
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    <p>I need to sort out few small matrices from 1 huge raw matrix ...according to sorting 1st column (1st column contain either 1, 2, or 3)...</p> <p>if 1st column is 1, then randomly 75% of the 1 save in file A1, 25% of the 1 save in file A2. </p> <p>if 1st column is 2, then randomly 75% of the 2 save in file B1, 25% of the 2 save in file B2.</p> <p>if 1st column is 3, then randomly 75% of the 3 save in file C1, 25% of the 3 save in file C2.</p> <p>how am i going to write the code?</p> <p>Example:</p> <p>a raw matrix has 15 rows x 6 columns:</p> <p>7 rows are 1 in 1st column, 5 rows are 2 in 1st column, and 3 rows are 3 in 1st column.</p> <pre><code>1 -0.05 -0.01 0.03 0.07 0.11 1 -0.4 -0.36 -0.32 -0.28 -0.24 1 0.3 0.34 0.38 0.42 0.46 1 0.75 0.79 0.83 0.87 0.91 1 0.45 0.49 0.53 0.57 0.61 1 0.8 0.84 0.88 0.92 0.96 1 0.05 0.09 0.13 0.17 0.21 2 0.5 0.54 0.58 0.62 0.66 2 0.4 0.44 0.48 0.52 0.56 2 0.9 0.94 0.98 1.02 1.06 2 0.85 0.89 0.93 0.97 1.01 2 0.75 0.79 0.83 0.87 0.91 3 0.36 0.4 0.44 0.48 0.52 3 0.6 0.64 0.68 0.72 0.76 3 0.4 0.44 0.48 0.52 0.56 </code></pre> <p>7 rows got 1 in 1st column, randomly take out 75% of 7 rows (which is 7*0.75=5.25) to be new matrix (5rows x 6 columns), the rest of 25% become another new matrix</p> <p>5 rows got 2 in 1st column, randomly take out 75% of 5 rows (which is 5*0.75=3.75) to be new matrix (4rows x 6 columns), the rest of 25% become another new matrix</p> <p>3 rows got 3 in 1st column, randomly take out 75% of 3 rows (which is 3*0.75=2.25) to be new matrix (2rows x 6 columns), the rest of 25% become another new matrix</p> <p>Result:</p> <pre><code>A1= 1 -0.4 -0.36 -0.32 -0.28 -0.24 1 0.3 0.34 0.38 0.42 0.46 1 0.75 0.79 0.83 0.87 0.91 1 0.8 0.84 0.88 0.92 0.96 1 -0.05 -0.01 0.03 0.07 0.11 B1= 2 0.9 0.94 0.98 1.02 1.06 2 0.85 0.89 0.93 0.97 1.01 2 0.5 0.54 0.58 0.62 0.66 2 0.75 0.79 0.83 0.87 0.91 C1= 3 0.36 0.4 0.44 0.48 0.52 3 0.4 0.44 0.48 0.52 0.56 </code></pre>
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      1. POmatlab: sorting and random
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    1. COCan you clarify your question? Perhaps give us an example?
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      1. USHannes Ovrén
    2. COsimilar question: http://stackoverflow.com/questions/6501922/sample-specific-rows-in-matlab
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      1. USAmro
 

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