Finite Element In Java - Computing Stiffness Matrix For ISOTROPIC Case
Apr 2, 2014
I build some finite element in java. I try to optimize my running time. I do some double loop and use inside the loop in if else statement and also in switch case .
The loop is very long, sometimes become ~500 X 500.
You think that if i avoid from the if statement and the switch case inside the loop i will improve the time calculation by at least 10%?There is something that i must to avoid ?
// Computing stiffness matrix.
switch (materialType) {
case ISOTROPIC:
// Computing stiffness matrix for ISOTROPIC case.
for (int row = 0, nvfi2 = nvfi * 2, index = 0, fieldsNvf = fields * nvfi; row < fieldsNvf; row++) {
if (row == nvfi) {
leftZeroMatrix = 3;
I develop a finite element code at java. I am looking for efficiency solver and fast for large, sparse , symmetric and positive define matrices .
i used in jblas but i encounter in problem when the matrix has high condition number(ill condition number) and i get error for singular matrix while in mathematica i succeed to solve that system without problems...
Any good solver and fast solver package in java can i use for solving that system?
I have to create a program that asks a user to enter an amount for rows and an amount for columns. After they input both amounts, they must fill in the matrix with values (values of double data type). After they enter the values, the program is suppose to search the matrix for the element with the highest value. Once it is found, the user will be prompted with the location of the highest value within the array. I got it to work as to where the user inputs the values and he/she will receive a location of an element. However what they receive is incorrect.
For example
"Enter number of rows: 3 Enter number of columns: 4 Enter values: 23.5 6 13 2 1 5 6 3 7 5 9 2"
Once they enter the last value, they will be prompted with
"The highest element is located in 34".
As you can tell, the highest element is located in 01. I think when the user is prompted with the values that they enter for the rows and columns. How can I modify my code as to where it shows the actual location of the highest value?
I'm trying to divide the array into two parts and then compute. And save the changes made in a global array f, The problem is the code does't work for the second call. The changes are overshadowed. How can I start computing and make necessary changes so that the calculation is retained?
I'm trying to divide the array into two parts and then compute. And save the changes made in a global array f, The problem is the code does't work for the second call. The changes are overshadowed. How can I start computing and make necessary changes so that the calculation is retained?
I want to run a program to add an element as the third element of stack without changing rankings, I am trying to use two stack and I don't know how to push the top of first stack in the second: push(top(); this line
public void ADD(int element,int i ){ if(isEmpty(true)){ push(element);} else{ makeNull(); while((i<=3) && (isEmpty(false))){ push(top(); }
If my file name is MyBigXMLFile.xml it won't delete but if I rename it to mybigxmlfile.xml it will delete. How do you get around the case sensitive issue?
I need the username produced by this program to be in all lower case. The code is below.
/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */
package dcollinshw03; import java.util.Scanner; import java.util.Random; public class DcollinsHW03 { public DcollinsHW03() {
The problem is, the values are completely different than they are saved in MATLAB, and probably I need to shift the values after transforming them into byte arrays.My Java code which reads values of floating numbers from a MATLAB bin file as follows:
import java.io.*; import java.io.File; import javax.imageio.ImageIO; import java.nio.ByteBuffer; // may be useful? public class floatingNumberMatrixReader {
So I was given the program that calculates N!/[R!(N-R)!] and it has an overflow error after it passes N=18 and then starts spiting out incorrect answer. I'm supposed to figure out a way to protect the user from getting erroneous results when computing the formula (i.e. N!/[R!(N-R)!]).
HERE IS THE PROGRAM:
public class Combination { private static final int defaultNMax = 30; public Combination() {} int compute(int N, int R) { int i; int numerator; int denominator; numerator = 1;
I need to write a java program to find the index of the element whose value is the sum of the remaining elements. Recently I have been asked this question in an Interview which I couldnt solve properly.
I am attempting to write a program that reads a nonnegative integer and computes and prints its factorial. So far I have: Java Code: import java.util.Scanner;
public class Chapter3point37 { public static void main(String[] args) { Scanner input = new Scanner(System.in); int nonNegative = 5; int count=1; int product=1; int factor=1; System.out.println("Input a nonnegative integer: "); nonNegative = input.nextInt();
[code]...
how I should correctly prompt the user to input the values.
Given a string, compute a new string where identical chars that are adjacent in the original string are separated from each other by a "*". My implementation :
package com.tcs.dash; public class StringBuild { public String edit(String userIp){ StringBuilder builder = new StringBuilder(userIp); String replaceText = ""; for(int i = 0; i < builder.length() - 1; i++){ if(builder.charAt(i) == builder.charAt(i+1)){ replaceText = builder.charAt(i) + "*" + builder.charAt(i+1); builder = builder.replace(i, i+1, replaceText); } } return builder.toString(); } }
I am getting error at line 13. An exception actually.
I/P given = aaaa
Console:
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space at java.util.Arrays.copyOf(Unknown Source) at java.lang.AbstractStringBuilder.expandCapacity(Unknown Source) at java.lang.AbstractStringBuilder.ensureCapacityInternal(Unknown Source) at java.lang.AbstractStringBuilder.replace(Unknown Source) at java.lang.StringBuilder.replace(Unknown Source) at com.tcs.dash.StringBuild.edit(StringBuild.java:13) at com.tcs.dash.StringBuildExample.main(StringBuildExample.java:14)
I am new to Java and would like to ask how to do this question specifically:
Code a Java method that accepts a String array and a String. The method should return true if the string can be found as an element of the array and false otherwise. Test your method by calling it from the main method which supplies its two parameters (no user input required). Use an array initialiser list to initialise the array you pass. Test thoroughly.
why this switch code does not work for the 'Q'. Everything works fine for the other cases, i.e. 1,2,3, and 'q', but when I type in 'Q', I get the default case. Please note all the values have been defined in an earlier part of the code but for simplicity's sake I have removed them below
do { switch (choix) { //demande le nombre de patons a achete case '1':
I am making a programme for a calculator to - Divide, multiply, add and subtract. I have the code written but when I am running it and trying to add it was for some subtracting ....
import javax.swing.JOptionPane; public class calculator3 { public static void main(String[] args){ String number1,number2,operatorstring; double result=0,a,b;
I'm trying to create a simple java math question quiz using random operators, but keep sinking myself into deeper despair. The numbers must range from 0-9 and given an operator: +,-,/,*,%. Can't create a new method or use Case statements. The code isn't finished but don't want to make it any worse.
package marco; import java.util.Scanner; import java.util.Random; public class Project { public static void main(String[] args) { Scanner keyboard = new Scanner(System.in); Random rand = new Random(); System.out.println("How many questions do you want?");
int grade = 68; switch (grade) { case 100: System. out.println( "You got an A. Great job!" ); break; case 80: System. out.println( "You got a B. Good work!"); break;
If I have an integer variable like int a=9 then in the switch case If i write
switch(a) { case 4+a: System.out.println("hii"); }
Then why is this statement a compile-time error that variables cannot be used inside a case statement why does the compiler not subtitutes the values in place of the variables.
So basically what problem it creates for which the language developers did not include it as a proper syntax,is there any reason behimd this because of jump table?
