How to select specific percentage of items from a vector in matlab?
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I have used datasample() and randsample() to select specific no. of items randomly from a vector. But I have to specify the no. of items explicitly. Is there any way to specify percentage instead?
matlab
asked Nov 10 at 12:06
Talha Yousuf
184
add a comment |
up vote
0
down vote
favorite
I have used datasample() and randsample() to select specific no. of items randomly from a vector. But I have to specify the no. of items explicitly. Is there any way to specify percentage instead?
matlab
asked Nov 10 at 12:06
Talha Yousuf
184
3
Why can't you don = floor(% * N), wherenis the number of items you have to specify,%is the percentage you want, andNis the total number of elements in the vector? This seems pretty straightforward...
– Wolfie
Nov 10 at 12:19
@Wolfie thanks it worked, please post it as answer so that I may mark it correct
– Talha Yousuf
Nov 10 at 13:32
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I have used datasample() and randsample() to select specific no. of items randomly from a vector. But I have to specify the no. of items explicitly. Is there any way to specify percentage instead?
matlab
asked Nov 10 at 12:06
Talha Yousuf
184
I have used datasample() and randsample() to select specific no. of items randomly from a vector. But I have to specify the no. of items explicitly. Is there any way to specify percentage instead?
matlab
matlab
asked Nov 10 at 12:06
Talha Yousuf
184
asked Nov 10 at 12:06
Talha Yousuf
184
asked Nov 10 at 12:06
Talha Yousuf
184
asked Nov 10 at 12:06
Talha Yousuf
184
asked Nov 10 at 12:06
Talha Yousuf
184
184
3
Why can't you don = floor(% * N), wherenis the number of items you have to specify,%is the percentage you want, andNis the total number of elements in the vector? This seems pretty straightforward...
– Wolfie
Nov 10 at 12:19
@Wolfie thanks it worked, please post it as answer so that I may mark it correct
– Talha Yousuf
Nov 10 at 13:32
add a comment |
3
Why can't you don = floor(% * N), wherenis the number of items you have to specify,%is the percentage you want, andNis the total number of elements in the vector? This seems pretty straightforward...
– Wolfie
Nov 10 at 12:19
@Wolfie thanks it worked, please post it as answer so that I may mark it correct
– Talha Yousuf
Nov 10 at 13:32
3
3
Why can't you do
n = floor(% * N), where n is the number of items you have to specify, % is the percentage you want, and N is the total number of elements in the vector? This seems pretty straightforward...– Wolfie
Nov 10 at 12:19
Why can't you do
n = floor(% * N), where n is the number of items you have to specify, % is the percentage you want, and N is the total number of elements in the vector? This seems pretty straightforward...– Wolfie
Nov 10 at 12:19
@Wolfie thanks it worked, please post it as answer so that I may mark it correct
– Talha Yousuf
Nov 10 at 13:32
@Wolfie thanks it worked, please post it as answer so that I may mark it correct
– Talha Yousuf
Nov 10 at 13:32
add a comment |
1 Answer
1
active
oldest
votes
up vote
2
down vote
You can very easily convert between the percentage of data you want, and the number which is required by the functions you want to use...
n = floor( pct * N );
Where n is the number of items you have to specify, pct is the percentage you want to input (between 0 and 1), and N is the total number of elements in the vector.
You could use a different rounding function to floor (ceil/round), but floor is a good go-to so that you protect against requesting n > N elements due to numerical error or otherwise.
answered Nov 10 at 13:37
Wolfie
14.9k51742
add a comment |
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
2
down vote
You can very easily convert between the percentage of data you want, and the number which is required by the functions you want to use...
n = floor( pct * N );
Where n is the number of items you have to specify, pct is the percentage you want to input (between 0 and 1), and N is the total number of elements in the vector.
You could use a different rounding function to floor (ceil/round), but floor is a good go-to so that you protect against requesting n > N elements due to numerical error or otherwise.
answered Nov 10 at 13:37
Wolfie
14.9k51742
add a comment |
up vote
2
down vote
You can very easily convert between the percentage of data you want, and the number which is required by the functions you want to use...
n = floor( pct * N );
Where n is the number of items you have to specify, pct is the percentage you want to input (between 0 and 1), and N is the total number of elements in the vector.
You could use a different rounding function to floor (ceil/round), but floor is a good go-to so that you protect against requesting n > N elements due to numerical error or otherwise.
answered Nov 10 at 13:37
Wolfie
14.9k51742
add a comment |
up vote
2
down vote
up vote
2
down vote
You can very easily convert between the percentage of data you want, and the number which is required by the functions you want to use...
n = floor( pct * N );
Where n is the number of items you have to specify, pct is the percentage you want to input (between 0 and 1), and N is the total number of elements in the vector.
You could use a different rounding function to floor (ceil/round), but floor is a good go-to so that you protect against requesting n > N elements due to numerical error or otherwise.
answered Nov 10 at 13:37
Wolfie
14.9k51742
You can very easily convert between the percentage of data you want, and the number which is required by the functions you want to use...
n = floor( pct * N );
Where n is the number of items you have to specify, pct is the percentage you want to input (between 0 and 1), and N is the total number of elements in the vector.
You could use a different rounding function to floor (ceil/round), but floor is a good go-to so that you protect against requesting n > N elements due to numerical error or otherwise.
answered Nov 10 at 13:37
Wolfie
14.9k51742
answered Nov 10 at 13:37
Wolfie
14.9k51742
answered Nov 10 at 13:37
Wolfie
14.9k51742
answered Nov 10 at 13:37
Wolfie
14.9k51742
14.9k51742
add a comment |
add a comment |
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3
Why can't you do
n = floor(% * N), wherenis the number of items you have to specify,%is the percentage you want, andNis the total number of elements in the vector? This seems pretty straightforward...– Wolfie
Nov 10 at 12:19
@Wolfie thanks it worked, please post it as answer so that I may mark it correct
– Talha Yousuf
Nov 10 at 13:32