Data Science

 Data science is a field study related to data, to bring out meaningful business insights for effective decision making.

Stages of Analytics:

1. Descriptive analytics.
2. Diagnostic analytics.
3. Predictive analytics.
4. Prescriptive analytics.
5. Highest level of analytics.

Descriptive analytics:

        

                Answers questions on what happened in the past and present.

                Example: Number  of Covid-19 cases to date across various countries.

Diagnostic Analytics:

                Answers questions on why something happened.

                Example:Answers questions on why Covid -19 cases are increasing?

Predictive Analytics:

                Answers questions on what might happens in the future.

                Example: what will be Number of covid 19 cases in the next month.

Prescriptive Analytics:

                Provides Remedies and solutions for what might happen in the future.

                Example: what should be done to avoid the spread of covid 19 cases. which might                                             increase in the next one month

                

CRISP -DM: Cross Industry Standard Process for Data Mining:

Business Understanding ---> Data Collection ---> Data Cleansing and exploratory data analysis--->

Data Mining and Model Development --> Model evaluation ---> Deployment.

CRISP - DM for Business understanding:

Articulate the business problem by understanding the client/customer requirement.

Formulate Business Objective       Formulate Business constraint

Few Example of Business objective and Business Constraint:

Business problem: Significant proportion of customers who taken loan are unable to pay.

Business objective: Minimize loan defaulters.

Business Constraint: Maximize profits.

Key points to remember:

Ensure that objective and constraints are SMART.

specific measurable achievable relevant time bound

A suitable JVM could not be found in Linux

Problem: A suitable JVM could not be found. Please run the program again using the option -is: javahome <JAVA HOME DIR>

Problem: The installer is unable to run in graphical mode. Try running the installer with the -console or -silent flag.

Solution: I installed orcle brm same problem occours I will have search in the google but solution in  my point view I missied some libraries.

First everyone install java using:

                                    yum install java

after that install :

                                    yum install libXtst.i686

main thing you can install in GUI mode must run xmanager or xming type of GUI softwares.

Set the putty connections properly:

                 In the putty Enable X11 forwarding correctly

Return value of printf() function in C

Return value of printf() function in C

Ans:

A function always returns a value and printf function returns the number of characters successfully printed.

main() 
{ 
int s=1; 
printf("%d",printf("%d %d %d", s,s,s)); 
}

In this above program the inner printf is first called which prints value of s, three times with space between each value, 1 1 1.

Total 5 characters get printed = 3 values and 2 spaces).

As explained earlier the inner printf after printing the values, returns the number of characters printed, 5 which is printed by the outer printf.

The output of the above program is

1 1 1 5

RUNNING ANT BUILD.XML GETTING: JAVA VIRTUAL MACHINE LAUNCHER: COULD NOT FIND THE MAIN CLASS. PROGRAM WILL EXIT

sol:

1) Is the path to java bin directory set properly?? (To check this you need to write command javac in command prompt(cmd) and you will get a list of instructions on cmd console)

 how to set properly bin &pathsetup click here step by step

BRM System Architecture

BRM System Architecture consists 4 Tiers:

• Application Tier
• Connection Management Tier
• Data Management Tier
• Data Tier

fig:BRM System Architecture

 

`gets' function is dangerous how to solve this error and why gets function is dangerous?

  `gets' function is dangerous how to solve this error and why gets function is dangerous?







Never use gets(). Because it is impossible to tell without knowing the data in advance how many characters gets() will
read, and because gets() will continue to store characters past the end of the buffer, it is extremely dangerous to use.
It has been used to break computer security. Use fgets() instead.

so we can use fgets():
In the C Programming Language, the fgets function reads characters from the stream pointed to by stream.
The fgets function will stop reading when n-1 characters are read, the first new-line character is encountered in s, or at the end-of-file, whichever comes first. Then the fgets function will append a null character to the string.

Syntax

The syntax for the C Language fgets function is:

char *fgets(char *s, int n, FILE *stream);

s is the array where the characters that are read will be stored.

n is the size of s.

stream is the stream to read.

The fgets function returns s. The fgets function will return a null pointer if an error occurs while trying to read the stream or the end of the stream is encountered before any characters are stored.

In the C Language, the required header for the fgets function is:

#include 

#include 
char * fgets(char *restrict s, int n, FILE *restrict stream);

Frightening, no? That’s because fgets() is a file function, which reads text from a file, as in “file get string.” That’s how programmers talk after an all-nighter.
Because the operating system considers standard input like a file, you can use fgets() to read text from the keyboard.
Here’s a simplified version of the fgets() function as it applies to reading text input:

fgets(string,size,stdin);

In this example, string is the name of a char array, a string variable; size is the amount of text to input plus one, which should be the same size as the char array; and stdin is the name of the standard input device, as defined in the stdio.h header file.
THE FGETS() FUNCTION READS A STRING

#include 
int main()
{
  char name[10];
  printf("Who are you? ");
  fgets(name,10,stdin);
  printf("Glad to meet you, %s.\n",name);
  return(0);
}