conditional-statements

问题 Is it possible to create automatic Notes based on cells variable values resulting from formulas ? For example A1=stxt(B1;1;4) gives "some" with B1=sometext (variable value), so that A1's Note would be "some" And a second question : how to add at least a third condition for exceptions treatment in mySelection.getValues().flat().map(v=>[v=="/" || ""?null:v]); // or #N/A or #VALUE! I didn't neither succeed having many OR conditions in one single code line so that I have to put many if statements

问题 I have a situation like the following: myObservable1.pipe( switchMap((result1: MyObservable1) => { if (condition) { return myObservable2; } else { return of(null); } }) ).subscribe(myObservable1 | myObservable2) => { So if condition is false I only have to perform one request, if the condition is true, I have to chain the first request to the following one, they are essentially two requests to the server api. Is there a better solution without returning that null ? Is there any conditional

问题 I have a situation like the following: myObservable1.pipe( switchMap((result1: MyObservable1) => { if (condition) { return myObservable2; } else { return of(null); } }) ).subscribe(myObservable1 | myObservable2) => { So if condition is false I only have to perform one request, if the condition is true, I have to chain the first request to the following one, they are essentially two requests to the server api. Is there a better solution without returning that null ? Is there any conditional

问题 I would like to understand how cmp and je/jg work in assembly. I saw few examples on google but I am still little bit confused. Below I have shown a part of assembly code that I am trying to convert to C language and the corresponding C code. Is it implemented in the right way or do I have a wrong understanding of how cmp works? cmp $0x3,%eax je A cmp $0x3,%eax jg B cmp $0x1,%eax je C int func(int x){ if(x == 3) goto A; if (x >3) goto B; if(x == 1) goto C; A: ...... B: ...... C: ...... 回答1:

问题 I would like to understand how cmp and je/jg work in assembly. I saw few examples on google but I am still little bit confused. Below I have shown a part of assembly code that I am trying to convert to C language and the corresponding C code. Is it implemented in the right way or do I have a wrong understanding of how cmp works? cmp $0x3,%eax je A cmp $0x3,%eax jg B cmp $0x1,%eax je C int func(int x){ if(x == 3) goto A; if (x >3) goto B; if(x == 1) goto C; A: ...... B: ...... C: ...... 回答1:

问题 I would like to understand how cmp and je/jg work in assembly. I saw few examples on google but I am still little bit confused. Below I have shown a part of assembly code that I am trying to convert to C language and the corresponding C code. Is it implemented in the right way or do I have a wrong understanding of how cmp works? cmp $0x3,%eax je A cmp $0x3,%eax jg B cmp $0x1,%eax je C int func(int x){ if(x == 3) goto A; if (x >3) goto B; if(x == 1) goto C; A: ...... B: ...... C: ...... 回答1:

问题 I am trying to capture the date of the “visit_num==2” of “users” in a new column ("2nd_visit_date") Here's the code (including the new column I want to create) df=pd.DataFrame({'user':[1,1,2,2,2,3,3,3,3,3,4,4], 'date':['1995-09-01','1995-09-02','1995-10-03','1995-10-04','1995-10-05','1995-11-07','1995-11-08','1995-11-09','1995-11-10','1995-11-15','1995-12-18','1995-12-20'], 'visit_num':[1,2,1,2,3,1,2,3,4,5,1,2], '2nd_visit_date':['1995-09-02','1995-09-02','1995-10-04','1995-10-04','1995-10-04

问题 I am trying to capture the date of the “visit_num==2” of “users” in a new column ("2nd_visit_date") Here's the code (including the new column I want to create) df=pd.DataFrame({'user':[1,1,2,2,2,3,3,3,3,3,4,4], 'date':['1995-09-01','1995-09-02','1995-10-03','1995-10-04','1995-10-05','1995-11-07','1995-11-08','1995-11-09','1995-11-10','1995-11-15','1995-12-18','1995-12-20'], 'visit_num':[1,2,1,2,3,1,2,3,4,5,1,2], '2nd_visit_date':['1995-09-02','1995-09-02','1995-10-04','1995-10-04','1995-10-04

问题 I have a dataset as follows: library(data.table) DT <- structure(list(State_Ab = c("MD", "MD", "MD", "MD", "MD", "MD", "MD", "MD", "MD", "MD", "MD", "MD", "MD", "MD"), County = c("Baltimore", "Baltimore", "Baltimore", "Baltimore", "Baltimore", "Baltimore", "Baltimore", "Baltimore", "Baltimore", "Baltimore", "Baltimore", "Baltimore", "Baltimore", "Baltimore"), year = c(1994, 1994, 1998, 1998, 2000, 2000, 2004, 2004, 2006, 2006, 2010, 2010, 2016, 2016), Population = c(140942, 219673, 235413,

问题 I have a dataset as follows: library(data.table) DT <- structure(list(State_Ab = c("MD", "MD", "MD", "MD", "MD", "MD", "MD", "MD", "MD", "MD", "MD", "MD", "MD", "MD"), County = c("Baltimore", "Baltimore", "Baltimore", "Baltimore", "Baltimore", "Baltimore", "Baltimore", "Baltimore", "Baltimore", "Baltimore", "Baltimore", "Baltimore", "Baltimore", "Baltimore"), year = c(1994, 1994, 1998, 1998, 2000, 2000, 2004, 2004, 2006, 2006, 2010, 2010, 2016, 2016), Population = c(140942, 219673, 235413,