Excel VLOOKUP formula

Syntax : VLOOKUP (value, table, col_index, [range_lookup])

• Value : The value to search from first column of a table
• Table : Table range
• col_index : which column of the table to retrieve the data.
• range_lookup : False – Exact Match/True approximate match

The syntax can be summarized as as VLOOKUP(Value to look up, table range to lookup the value, table column number to return the value,FALSE/TRUE)

Example 

• Value : C14 – the cell to write the Name 
• Table :B3:E6 the range of the table from B2 until E6.
  
• col_index : 2 , the second column of the table.
• range_lookup : False – Exact Match
• Syntax : VLOOKUP(C14,B2:E6,2,FALSE)

Compared to all the methods, checking whether a string is number or not by using regular expression is basically the easiest.

The comparison is based on pattern matching, regular expression is used to create the pattern and is compared to the string. If the pattern match it will return TRUE, if the pattern mismatch it will return FALSE. 

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public static boolean isNumeric(String token) { 

String regex,regex1,regex2; 

    regex = "[-+]?[0-9]+.?[0-9]+";

    regex1 = "[-+]?[0-9]+.?"; 

    regex2 = "[-+]?.?[0-9]+";

return token.matches(regex)|token.matches(regex1)|token.matches(regex);

}

}

public static void main(String[] args) // starting a program in Java

is one of the strange line for Java beginners. It automatically trigger a question, why its like that. Compared to

 void main() // starting a program in C

in C which are much simpler.

So what does it means?

First of all lets go back to main, and void main.

Main is basically the entry point of the program. The main program then can invoke any other function.

void means the main program returns nothing to the operating system.

So what is public and static for in Java?

Public – Public is to declare that the method main is a public method.  Main method must be public so that Java Virtual machine can find the main method.

Above program is example of how to print hello world in Java.

To print out, java print method is used.

 System.out.println("Hello World!");

println will print the string “Hello World” together with a new line.

In this blog, we are using MathTex equation editor plugin which can be downloaded for free.

Installing MathTex equation editor plugin will add an icon to the WordPress editor Toolbar. Clicking the icon will execute a popup to create and insert the equation into blog post.

Given that, the formula of I in term of p are as follows:

By using excel , the graph are as follows: