concat

问题 So I'm trying to add to a string and it shows up as empty. var DNA = "TAG"; var mRNA = ""; m_RNA() function check(a, b, string) { if (string = a) { mRNA.concat(b); } } function m_RNA(){ //console.log(DNA) for (var i = 0; i < DNA.length; i++) { console.log("Checking: " + DNA[i]); check("T", "A", DNA[i]); check("A", "U", DNA[i]); check("C", "G", DNA[i]); check("G", "C", DNA[i]); console.log(mRNA); } } Its supposed to show AUC in the console but its just blank. This is through firefox by the way

问题 So I'm trying to add to a string and it shows up as empty. var DNA = "TAG"; var mRNA = ""; m_RNA() function check(a, b, string) { if (string = a) { mRNA.concat(b); } } function m_RNA(){ //console.log(DNA) for (var i = 0; i < DNA.length; i++) { console.log("Checking: " + DNA[i]); check("T", "A", DNA[i]); check("A", "U", DNA[i]); check("C", "G", DNA[i]); check("G", "C", DNA[i]); console.log(mRNA); } } Its supposed to show AUC in the console but its just blank. This is through firefox by the way

问题 I have (more than) two dataframes: In [22]: df = pd.DataFrame({'database' : ['db1', 'db2', 'db3']}) In [23]: df1 = pd.DataFrame({'database' : ['db1', 'db2', 'db3']}) In [24]: df2 = pd.DataFrame({'database' : ['db2', 'db3', 'db4']}) In [25]: df1 Out[25]: database 0 db1 1 db2 2 db3 In [26]: df2 Out[26]: database 0 db2 1 db3 2 db4 What I want as output is dataframe in this format: Out[45]: database database 0 db1 1 db2 db2 2 db3 db3 3 db4 I manage to get it in this format like this: df1.index =

问题 Instead of this example where it is horizontal After Pandas Dataframe pd.concat I get NaNs, I'm trying vertical: import pandas a=[['Date', 'letters', 'numbers', 'mixed'], ['1/2/2014', 'a', '6', 'z1'], ['1/2/2014', 'a', '3', 'z1'], ['1/3/2014', 'c', '1', 'x3']] df = pandas.DataFrame.from_records(a[1:],columns=a[0]) f=[] for i in range(0,len(df)): f.append(df['Date'][i] + ' ' + df['letters'][i]) df['new']=f c=[x for x in range(0,5)] b=[] b += [['NA'] * (5 - len(b))] df_a = pandas.DataFrame.from

问题 I am trying to concat/merge rows in a table to one single row. I tried using listagg but due to varchar limitation this doesn't work. create table tmp(word VARCHAR2(4000), lvl NUMBER); insert into tmp2 values('python',1); insert into tmp2 values('java',2); select listagg(word,' ') within group(order by lvl) as listagg_output from tmp; The output should look like python java. 回答1: What will you do with such a long string? Anyway, have a look at this example; if listagg won't work, xmlagg will.

问题 I am trying to concatenate all columns of a pandas dataframe so that I end up with 1 column that contains all the values from the dataframe. The following code does this: df2 = pd.concat([df[0], df[1], df[2], df[3], df[4], df[5], df[6], df[7]]) But I would like to be able to do this with dataframes that have different numbers of columns. When I tried: dfpr2 = pd.concat([df.columns) I get the following error: "cannot concatenate object of type <class 'pandas.core.indexes.range.RangeIndex> ;

问题 I am trying to concatenate all columns of a pandas dataframe so that I end up with 1 column that contains all the values from the dataframe. The following code does this: df2 = pd.concat([df[0], df[1], df[2], df[3], df[4], df[5], df[6], df[7]]) But I would like to be able to do this with dataframes that have different numbers of columns. When I tried: dfpr2 = pd.concat([df.columns) I get the following error: "cannot concatenate object of type <class 'pandas.core.indexes.range.RangeIndex> ;

问题 I have many columns of concatenated data that I would like to split by spaces. So from this: To this: This VBA code is very close, Sub TextToColumns() 'Deines Last Row Dim LastRow As Long LastRow = 1048576 'the last row possible in excel 'optional alternative **LastRow** Code 'Counts number of rows (counts from last row of Column A): 'Dim LastRow As Long 'LastRow = Cells(Rows.Count, "A").End(xlUp).Row 'Counts number of Columns (my headers start in row 1) Dim LastColumn As Long LastColumn =

问题 I am trying to write a code in C that reads n words from a file and modifies the content word by word. The program will count the number of vowels in each word. If the number of vowels in the current word is even, the program will swap the vowels in pair of two (no swapping in case of odd number), then it will attach the number of vowels to the word. For example if the word is apple , the modified word will look like eppla_2vow . My problem is that I don't quite know how am I supposed to make

问题 I would like to take the sass output and concat it to another css regular file. example: animate.css app.scss return gulp.src('app.scss') .pipe(sass({ errLogToConsole: true })) .pipe(concat(['animate.css', OUTPUT_OF_THE_SASS_ABOVE])) .pipe(gulp.dest(paths.public+'css/')) .pipe(rename({ extname: '.min.css' })) .pipe(gulp.dest('css/')) .on('end', done); any ideas how to do it? ******* IDEA maybe is it possible to generate the css file from sass in to a temp location, then concat it with css