Programmer Guide/Command Reference/EVAL/vvset: Difference between revisions
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Create a copy of the vector ''x'' and replace elements. | Create a copy of the vector ''x'' and replace elements. | ||
---- | ---- | ||
;Usage 1: | ;Usage 1: <code>vvset(<var>x</var> , <var>y</var> {, <var>o</var> {, <var>d</var>, <var>n</var>}}})</code> | ||
:;<var>x</var>: source vector | :;<var>x</var>: source vector | ||
:;<var>y</var>: replace value (scalar) | :;<var>y</var>: replace value (scalar) | ||
:;<var>o</var>: starting index, 0 | :;<var>o</var>: starting index, 0 ≤ o < <code>nrow(''x'')</code> (default=0) | ||
:;<var>d</var>: index increment (default=1) | :;<var>d</var>: index increment (default=1) | ||
:;<var>n</var>: number of values to replace (default=<code>nrow(''x'')</code>) | :;<var>n</var>: number of values to replace (default=<code>nrow(''x'')</code>) | ||
;Result 1: The result ''r'' is copy of the vector ''x''. All elements <code>''r''[''o''+''i''*''d'']</code> (with: <code>''i'' = 0..''n''-1</code>) are replaced by the value <code>''y''</code>. | ;Result 1: The result ''r'' is copy of the vector ''x''. All elements <code>''r''[''o''+''i''*''d'']</code> (with: <code>''i'' = 0..''n''-1</code>) are replaced by the value <code>''y''</code>. | ||
---- | ---- | ||
;Usage 2: | ;Usage 2: <code>vvset(<var>x</var> , <var>y</var> {, <var>o</var> {, <var>d</var>}})</code> | ||
:;<var>x</var>: source vector | :;<var>x</var>: source vector | ||
:;<var>y</var>: replace vector | :;<var>y</var>: replace vector | ||
:;<var>o</var>: starting index, 0 | :;<var>o</var>: starting index, 0 ≤ o < <code>nrow(''x'')</code> (default=0) | ||
:;<var>d</var>: index increment (default=1) | :;<var>d</var>: index increment (default=1) | ||
;Result 2: The result ''r'' is copy of the vector ''x''. All elements <code>''r''[''o''+''i''*''d'']</code> (with: <code>''i'' = 0..nrow(''y'')-1</code>) are replaced by the value <code>''y''[''i'']</code>. | ;Result 2: The result ''r'' is copy of the vector ''x''. All elements <code>''r''[''o''+''i''*''d'']</code> (with: <code>''i'' = 0..nrow(''y'')-1</code>) are replaced by the value <code>''y''[''i'']</code>. | ||
---- | ---- | ||
The function | The function fails if an index value is out of bounds. | ||
;See also: [[../vv|vv]], [[../vvget|vvget]], [[../vvcat|vvcat]], [[../vmcol|vmcol]], [[../vmrow|vmrow]], [[../vsubn|vsubn]], [[../vsubc|vsubc]] | |||
[[../#Functions|<function list>]] | |||
Example: | Example: | ||
#a := eval fill(10,0,1) | |||
#a := eval fill(10,0,1) | #b := eval vvset($#a, -1, 1, 2, 5) | ||
#b := eval vvset($#a, -1, 1, 2, 5) | // → #b = { 0 , -1 , 2 , -1 , 4 , -1 , 6 , -1 , 8 , -1 } | ||
// | #c := eval vvset($#b, fill(4, 9, -3), 6, 1) | ||
#c := eval vvset($#b, fill(4, 9, -3), 6, 1) | // → #c = { 0 , -1 , 2 , -1 , 4 , -1 , 9 , 6 , 3 , 0 } | ||
// | // reverse vector indeces | ||
// reverse vector indeces | #arev := eval vvset($#a, $#a, $#a[]-1, -1) | ||
#arev := eval vvset($#a, $#a, $#a[]-1, -1) | // → #arev = { 9 , 8 , 7 , 6 , 5 , 4 , 3 , 2 , 1 , 0 } | ||
// | |||
Latest revision as of 19:03, 21 April 2011
Create a copy of the vector x and replace elements.
- Usage 1
vvset(x , y {, o {, d, n}}})- x
- source vector
- y
- replace value (scalar)
- o
- starting index, 0 ≤ o <
nrow(x)(default=0) - d
- index increment (default=1)
- n
- number of values to replace (default=
nrow(x))
- Result 1
- The result r is copy of the vector x. All elements
r[o+i*d](with:i = 0..n-1) are replaced by the valuey.
- Usage 2
vvset(x , y {, o {, d}})- x
- source vector
- y
- replace vector
- o
- starting index, 0 ≤ o <
nrow(x)(default=0) - d
- index increment (default=1)
- Result 2
- The result r is copy of the vector x. All elements
r[o+i*d](with:i = 0..nrow(y)-1) are replaced by the valuey[i].
The function fails if an index value is out of bounds.
Example:
#a := eval fill(10,0,1)
#b := eval vvset($#a, -1, 1, 2, 5)
// → #b = { 0 , -1 , 2 , -1 , 4 , -1 , 6 , -1 , 8 , -1 }
#c := eval vvset($#b, fill(4, 9, -3), 6, 1)
// → #c = { 0 , -1 , 2 , -1 , 4 , -1 , 9 , 6 , 3 , 0 }
// reverse vector indeces
#arev := eval vvset($#a, $#a, $#a[]-1, -1)
// → #arev = { 9 , 8 , 7 , 6 , 5 , 4 , 3 , 2 , 1 , 0 }
