I want to transfer data from a for loop into a vector, i need to use rows of a matrix, every 3rd number(not every 3rd entry) in first column( 2 to 5 repeated numbers for each, tho random). Prob is output length unknown so difficult to prelocate
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for x=[1,4,7,10,13,16,19,22,25,28,31,34,37,40,43,46,49,52,55,58,61,64,67,70,73,76,79,82,85,88,91,94,97,100,103,106,109,112,115,118,121,124,127,130,133,136,139,142,145,148,151,154,157,160,163,166,169,172,175,178,181,184,187,190,193,196,199,202,205,208,211,214,217,220,223,226,229,232,235,238,241,244,247,250,253,256,259,262,265,268,271,274,277,280,283,286,289,292,295,298,301,304,307,310,313,316,319,322,325,328,331,334,337,340,343,346,349,352,355,358,361,364,367,370,373,376,379,382,385,388,391,394,397,400,403,406,409,412,415,418,421,424,427,430,433,436,439,442,445,448,451,454,457,460,463,466,469,472,475,478,481,484,487,490,493,496,499,502,505,508,511,514,517,520,523,526,529,532,535,538,541,544,547,550,553,556,559,562,565,568,571,574,577,580,583,586,589,592,595,598,601,604,607,610,613,616,619,622,625,628,631,634,637,640,643,646,649,652,655,658,661,664,667,670,673,676,679,682,685,688,691,694,697,700,703,706,709,712,715,718,721,724,727,730,733,736,739,742,745,748]; %72 hour decimation=3, weekly 7, monthly 30
A = (fromehfs(:,1)==x );
out = fromehfs(A,:)
end
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Accepted Answer
Stephen23
on 15 Jul 2015
Edited: Stephen23
on 15 Jul 2015
x = [1,4,7,10,13,16,19,22,25,28,31,34,37,40,43,46,49,52,55,58,61,64,67,70,73,76,79,82,85,88,91,94,97,100,103,106,109,112,115,118,121,124,127,130,133,136,139,142,145,148,151,154,157,160,163,166,169,172,175,178,181,184,187,190,193,196,199,202,205,208,211,214,217,220,223,226,229,232,235,238,241,244,247,250,253,256,259,262,265,268,271,274,277,280,283,286,289,292,295,298,301,304,307,310,313,316,319,322,325,328,331,334,337,340,343,346,349,352,355,358,361,364,367,370,373,376,379,382,385,388,391,394,397,400,403,406,409,412,415,418,421,424,427,430,433,436,439,442,445,448,451,454,457,460,463,466,469,472,475,478,481,484,487,490,493,496,499,502,505,508,511,514,517,520,523,526,529,532,535,538,541,544,547,550,553,556,559,562,565,568,571,574,577,580,583,586,589,592,595,598,601,604,607,610,613,616,619,622,625,628,631,634,637,640,643,646,649,652,655,658,661,664,667,670,673,676,679,682,685,688,691,694,697,700,703,706,709,712,715,718,721,724,727,730,733,736,739,742,745,748];
B(:,2) = 1:6;
B(:,1) = [40,0,106,0,0,487]
idx = any(bsxfun(@eq,B(:,1),x),2);
out = B(idx,:)
which displays this in the command window:
>> Untitled
B =
40 1
0 2
106 3
0 4
0 5
487 6
out =
40 1
106 3
487 6
This is a kind of code vectorization, which is important to learn if you want to use MATLAB efficiently.
2 Comments
Jos (10584)
on 15 Jul 2015
I do not understand the question, but you can use ismember, rather then any and bsxfun to get idx:
idx = ismember(B(:,1),x)
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