digitalmars.D.learn - Missing array element
- Vino.B (19/19) Aug 29 2017 Hi,
- Francis Nixon (7/27) Aug 29 2017 The mismatch function doesn't work how your expecting it to. It
- =?UTF-8?Q?Ali_=c3=87ehreli?= (4/7) Aug 29 2017 You're looking for setDifference:
Hi, Can any one help me on the below program, as I need the missing element for array "a" to be printed when compared with array "b" Program: import std.stdio, std.array, std.algorithm; string[] a = ["test1", "test2", "test4"]; string[] b = ["test2", "test4"]; void main () { auto m = mismatch(a,b); writeln(m[0]); writeln(m[1]); } Output: ["test1", "test2", "test4"] ["test2", "test4"] Required output: "test1" From, Vino.B
Aug 29 2017
On Tuesday, 29 August 2017 at 18:20:38 UTC, Vino.B wrote:Hi, Can any one help me on the below program, as I need the missing element for array "a" to be printed when compared with array "b" Program: import std.stdio, std.array, std.algorithm; string[] a = ["test1", "test2", "test4"]; string[] b = ["test2", "test4"]; void main () { auto m = mismatch(a,b); writeln(m[0]); writeln(m[1]); } Output: ["test1", "test2", "test4"] ["test2", "test4"] Required output: "test1" From, Vino.BThe mismatch function doesn't work how your expecting it to. It compares the ith element in a with the ith element in b, until they encounter an element that is not equal. It then returns all elements including and beyond i, for both arrays. In this case the first element does not match, and therefore it returns the entire contents of both arrays.
Aug 29 2017
On 08/29/2017 11:20 AM, Vino.B wrote:string[] a = ["test1", "test2", "test4"]; string[] b = ["test2", "test4"];Required output: "test1"You're looking for setDifference: https://dlang.org/phobos/std_algorithm_setops.html#.setDifference Ali
Aug 29 2017
On Tuesday, 29 August 2017 at 18:39:03 UTC, Ali Çehreli wrote:On 08/29/2017 11:20 AM, Vino.B wrote:Hi, I tried the setDifference but does seem to be working as expected import std.stdio, std.array, std.algorithm; string[] a = ["test4", "test3", "test2", "test1"]; string[] b = ["test2", "test4"]; void main () { auto m = setDifference(a,b); writeln(m); } Output : Required output ["test3", "test1"] ["test3", "test2", "test1"] From, Vino.Bstring[] a = ["test1", "test2", "test4"]; string[] b = ["test2", "test4"];Required output: "test1"You're looking for setDifference: https://dlang.org/phobos/std_algorithm_setops.html#.setDifference Ali
Aug 29 2017
On Wednesday, 30 August 2017 at 06:16:16 UTC, Vino.B wrote:On Tuesday, 29 August 2017 at 18:39:03 UTC, Ali Çehreli wrote:https://dlang.org/phobos/std_algorithm_setops.html#.setDifferenceI tried the setDifference but does seem to be working as expectedFrom the documentation of setDifference: "The two ranges are assumed to be sorted by less." In other words, you will need to sort your ranges first. Either pre-sort them as string[] a = ["test1", "test2", "test3", "test4"]; string[] b = ["test2", "test4"]'; or call setDifference(a.sort(), b.sort()). -- Biotronic
Aug 30 2017