depaul university data science

valuesIs.na () is used to test whether the object is Na,is.nan () to test whether the object is Nan. Na is Nan, but Nan is not na,nan much deeper than NA.10. Data frameThe data frame is used to store tabular data and is created with Data.frame (). You can treat a data frame as a special list collection, with the same

An Introduction to the Data Science series at the University of johnkins In the past few months, I have taken Andrew Ng from Stanford University as a reference for his machine learning handout, on the CSDN blog, I wrote some summary notes related to machine learning and data

TRUEFALSE TRUEFALSE TRUE> x[good][11245Complete.cases () can also handle matrix data> airquality[1:6,] Ozone SOLAR.R Wind TempMonth Day1 A the 7.4 the 5 12 $ 118 8.0 the 5 23 A 149 12.6 About 5 34 - 313 11.5 + 5 45Na Na14.3 About 5 56 -NA14.9 the 5 6> Airquality[good, [1:6,] Ozone SOLAR.R Wind TempMonth Day1 A the 7.4 the 5 12 $

Problem Descriptionthis day the teacher as a routine to small Hao out a topic: The teacher to small Hao a string, let small Hao will the string in reverse order output. InputThe first line includes a T, which indicates how many sets of test data are:Next T line, each line includes a string (length not exceeding 65535).OutputFor each test data output it's reverse string.Sample Input1oaHoaiX EvoL ISample Outp

Problem DescriptionEnter the year to determine if the leap yearsInputEnter an integer n (multiple sets of data)OutputIf it is a leap year, output Yes, otherwise output no (one row per group of data)Sample Input2000Sample OutputYesMy Code:1#include 2 intMain ()3 { 4 intYear ;5 while(SCANF ("%d", year)! =EOF)6 {7 8 if((year%4==0 year% -!=0) || (year% -==0) ) 9 {Tenprintf"yes\n")

Problem DescriptionEnter an octal string, convert it to an equivalent decimal string, and output it in the PRINGF%s format.InputFirst, a positive integer t is entered, indicating that there is a T set of test data (1Next T line, one string per line, representing an octal integer (this integer is no more than 20 bits).OutputFor each test data, output the corresponding decimal string. One line per string.Samp

Problem DescriptionWater problemInputEnter a 3-digit number (the title contains multiple sets of test data)OutputSeparates the 3-digit hundred, 10-bit, and single-digit, inverted output (one row of test data per group)Sample Input250Sample Output052HINTSeparating out the numbers, you can use the remainder and the divisor.Note that in C, 2 integers are multiplied except for the result or integer, such as 8/3

Problem DescriptionWowapps most like to learn English, English class never skip class, but English has not been learned, because the class has been sleeping. Why do you sleep, because he thinks the English word is too long. Now Wowapps has a long, long, long word and wants to compress it. Can you help him?Compression: Replaces consecutive repeating letters with one, see sample for details.InputEnter an n first to indicate the number of words Wowapps give (1Next n lines, each behavior of a string

+ for(i=0; i) - $ { $ -scanf"%s",a); - the if(Fun (a) = =0) - Wuyiprintf"no\n"); the - Else Wu -printf"yes\n"); About $ } - - return 0; - A}#include #includestring.h>intMain () {Charstr[ -]; intn,i,j; scanf ("%d",N); while(n>0) {scanf ("%s", str); I=0; J=strlen (str)-1; while(ij) {if(str[i]!=Str[j]) Break; I++; J--; } if(i>j) printf ("yes\n"); Elseprintf ("no\n"); N--; } return 0;}Wuhan

Postgraduate experience in computer science at Wuhan University The key to postgraduate entrance exams lies in perseverance! Never accept failure, no matter how often it visits you. Keep on going. Never give up. Never! Why do you want to take an postgraduate entrance exam? Everyone can have their own reasons. Maybe it's just to have a relatively perfect college life, a wonderful start, and a wonderful end.

to write to the file"" Defines writing data to the file function "" " forIinchrange (num): U=Ulist[i] with open ('D:/test.txt','a') as data:Print(U, file=data)if __name__=='__main__': List= [] # I previously put list=[] in the for loop of the Get_data () function, resulting in each loop emptying the list before appending the data, and finally traversing the las

Hangzhou University of Electronic Science and Technology Online judge's "floating balloon (id1004)" solution report Clever if (Welcome to reprint, but please note the Source: http://blog.csdn.net/qiaoruozhuo) Description: Let the balloon rise Problem description Contest time again! How excited It is tosee balloons floating around. but to tell you a secret, the judges 'favoritetime is guessing the most popu

Physics topics, difficulty is not university physics #include #include #include using namespace Std; int Main (int argc, char const *argv[]) { long long A, b; while (Cin>>a>>b) {cout2 *a*bENDL; return 0 ;}UVA 10300 Read Test instructions, we know only ask area * friendly and on the line#include #include#includeusing namespacestd;intMain () {intT,n; intSquare,animal,enfriend; CIN>>T; while(t--) {cin>>N; intsum=0; while(n--) {c

' ch[i]'Z'|| ch[i]'Z' ch[i]>='a') - { -char_num++; the } - Else if(ch[i]==' ') - { -kongge_num++; + } - Else if(ch[i]>='0'ch[i]'9') + { Aint_num++; at } - Else - { -other_num++; - } - } inprintf"%d %d%d%d\n", char_num,int_num,kongge_num,other_num); - } to return 0; +}Other code:1#include 2#include string.h>3 intMain ()4 {5 Charstr[ -];//defining

Problem DescriptionThere is a cow, which has a small cow at the beginning of each year. Each heifer starts its fourth year with a heifer. Please program implementation how many cows are there in the first n years?InputThe input data consists of multiple test instances, one for each test instance, including an integer n (0N=0 indicates the end of the input data and does not handle it.OutputFor each test inst

Problem Descriptionn individuals in a circle, numbered from 1 to n sequentially. From the person numbered 1 starts 1 to K, where the number of people who count K out of the circle, the output of the last left a person's original numbers.InputFirst enter a T, which indicates that there is a T group of data (1Then there are t-lines, each with 2 positive integers n and K. (1OutputFor each set of test data, out

Problem DescriptionEnter n strings (nInputMultiple sets of test data. The first row of each set of test data contains an integer n, representing a total of n strings. Next, each line contains a string that consists of printable characters.OutputEach set of test sample output one row. The output finds a string that satisfies the test instructions.Sample Input3djdlkfjsadfjwedlkfjdlkfjl;jf;sfjdsl;al/dljfd2dlka

Problem DescriptionEnter the coordinates of 2 points in the plane coordinate system to output the distance between themInputEnter 4 floating-point numbers x1 y1 x2 y2, respectively (x1,y1) (x2,y2) coordinates (multiple sets of data)OutputOutputs the distance between them, preserving 2 decimal places (one row per group of data)Sample Input1 0 2 0Sample Output1.001#include 2 3#include 4 5 6 7 intMain ()8 9 {

Problem DescriptionJinjin on the middle school. Mother think Jinjin should study harder, so jinjin in addition to school, but also to participate in the mother for her to enroll in the various subjects review class. In addition, the weekly mother will send her to learn recitation, dance and piano. But Jinjin would be unhappy if he had been in school for more than eight hours a day, and the longer he would be unhappy. Suppose Jinjin not be unhappy with anything else, and her unhappy will not last

Problem DescriptionThe teacher gave a title to Xiao Hao: give you two integers x and n ( -10now that little Howe is in a quandary, please help him solve the problem. InputEnter two integers x and n per line.Outputfor each set of test data, the output line evaluates. Sample Input1 12 2Sample Output16HINT1#include 2 3 4 Long LongSumintXintN)5 {6 Long Longs=0;7 inti,j;8 Long LongS1;9 for(i=1; i)Ten { Ones1=1; A for(j=1; j) -