Processing Forum

counting how many files are in a folder ??

[2 Replies]
- 27-Feb-2013 07:37 AM
- Forum: General Discussion
is there a way to calculate how many files there are in a folder ??
For example I have 24 .txt files in a folder and I want a sketch
that counts the files so it outputs a number 24..

whats the difference between String[] abc and String abc[] ??

[3 Replies]
- 26-Feb-2013 01:26 AM
- Forum: Programming Questions
My question is as the title says, what is the difference between String[] abc, and String abc[] ??

image interpolation

[2 Replies]
- 03-Feb-2013 03:57 AM
- Forum: Programming Questions
i would like to do bilinear interpolation on an image..I had the program in C, and I understand how it works but i dont know what to replace the unsigned char image_in[][] and image_out[][] as i dont know what this represent..The RGB of grayscale?? the intensity?? could someone help me..im noob at this..
1. void scale(unsigned char image_in[Y_SIZE][X_SIZE], unsigned char image_out[Y_SIZE]
2. [X_SIZE], float zx, float zy){
3. int m,n;
4. float x,y,p,q;
5. int xs = X_SIZE/2;
6. int ys = Y_SIZE/2;
7. int d;
8. for(int i=-ys; i<ys; i++){
9. for(int j=-xs; j<xs; j++){
10. y = i/zy;
11. x = j/zx;
12. if(y > 0) m= (int)y;
13. else m = (int)(y-1);
14. if(x > 0) n = (int)x;
15. else n = (int)(x-1);
16. q = y - m;
17. p = x - n;
18. if(q == 1) {q = 0; m = m + 1;}
19. if(p == 1) {p = 0; n = n + 1;}
20. if( (m >= -ys) && (m < ys) && (n >= -xs) && (n < xs) ){
21. d = (int)((1.0-q)*((1.0-p)*image_in[m +ys][n +xs] + p*image_in[m +ys][n+1+xs]) + q*((1.0-p)*image_in[m+1+ys][n +xs] + p*image_in[m+1+ys][n+1+xs])); } else {
22. d = 0;
23. }
24. if(d < 0) d = 0;
25. if(d > 255) d = 255;
26. image_out[i+ys][j+xs] = d;
27. }
28. }
29. }

OpenCV in processing 1.5.1

[2 Replies]
- 03-Feb-2013 02:08 AM
- Forum: Contributed Library Questions
I downloaded the library and tried one of the example here.
Interpolation

When I run the sketch on processing 1.5.1, I got this error:
NoSuchMethodError: you may be using a library that's incompatible with this version of processing.

can somebody help?

how to lower kinect depth map resolution??

[0 Replies]
- 29-Jan-2013 10:42 AM
- Forum: Contributed Library Questions
im using simpleOpenNI and would like to lower the resolution from the default 640 x 480..
Is it possible?? If it is, how it is done? the lower the better..

I have a problem comparing strings..please help

[11 Replies]
- 25-Jan-2013 02:04 PM
- Forum: Programming Questions
I tried a simple program like below to just for test :
1. String a = "a";
2. String b = "a";
3. if(a == b){
4. print(true);
5. }
and its working. But when i tried to read a String from a text file and compare it, it doesnt work :
1. String read[] = loadStrings("locationOfTheFile"); //let say that we have 3 lines each with 2 columns,
2. //the String I would like to compare is at the
3. //1st column
4. String answer = "why"; //compare with this
5. for(int i=0; i<read.length; i++){
6. if( why == splitTokens(read[i])[0]){
7. println(true);
8. } else {
9. println(false);
10. }
11. }
I got all 3 lines as false but its actually got the same words "why"..could someone help??

how to use near mode for kinect on simpleOpenNI?? or is it not possible??

[0 Replies]
- 22-Jan-2013 09:04 AM
- Forum: Contributed Library Questions
I would like to use kinect's near mode on processing but I dont know how..
Could someone help me?

trying to read .txt incrementally..is it possible??

[5 Replies]
- 11-Jan-2013 12:30 AM
- Forum: Programming Questions
I would like to read .txt incrementally using for loop..I know this isnt working, just for example:
i want to read action1.txt, action2.txt, action3.txt

for i = 0 to i = 3
read action[i].txt;
end

Is this possible??
and if so, could somone teach me how??

[Solved]problem with kinect openni ??

[1 Reply]
- 20-Dec-2012 12:08 PM
- Forum: General Discussion
I got this kind of error when I try to tun my program

# A fatal error has been detected by the Java Runtime Environment:
#
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x6a7230f5, pid=4960, tid=5092
#
# JRE version: 6.0_24-b07
# Java VM: Java HotSpot(TM) Client VM (19.1-b02 mixed mode windows-x86 )
# Problematic frame:
# C [OpenNI.dll+0x130f5]

what does this mean and what should I do??
Helps are appreciated

is it possible to expand 2d array

[5 Replies]
- 16-Dec-2012 08:58 AM
- Forum: Programming Questions
for example , I have
double[][] A = new double[3][3];

and i want to expand it like, let say

double[4][3]..

is it possible??
I tried expand(), but it only works for 1d array..any help,ideas are kindly appreciated..

runtime error

[2 Replies]
- 03-Dec-2012 10:20 AM
- Forum: General Discussion
I got this error when i try to run my sketch:

Runtime Error!

Program: C:\processing-1.5.1\java\bin\java.exe

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team blabla..

What is the problem I dont understand..
I had this days before but restarting processing fixed it..this time i restart even my pc,but still the same..

is it possible to clear the content in .txt file??

[4 Replies]
- 28-Nov-2012 07:02 AM
- Forum: Programming Questions
I would like to know if it is possible to clear .txt file(without closing and open new createwriter() with the same file name)..??
If it possible, how to do it??

Im writing some 3 values of x,y,z position into txt file for 150 frame every 5 seconds(means 3x150 data in 5 seconds)..and I would like to clear those values as I wont be using it in the next 5 seconds or so..if I dont clear the values, the size of the txt file will continue to increase, and I would like to avoid that to happen..

I tried using arraylist to store those 3 values for 150 frames and then clear the contents by clear()..but the output visual becomes stiff and not smooth(I got about 80 frames in 5 seconds instead of 150)..so Im thinking of saving those values for a while in txt file and read the values from it..

Is there any other way to achieve what Im trying to do??Sorry,this would be second question..

it wont be any help but Ill put my code(necessary part) below anyway just in case
1. //if we're recording tell the recorder to capture this frame
2. if(recording){
3. recorder.recordFrame();
4. PVector recordedNeck2 = recorder.trackedJoints[0].getPosition().position;
5. PVector recordedLeftShoulder2 = recorder.trackedJoints[1].getPosition().position;
6. PVector recordedLeftElbow2 = recorder.trackedJoints[2].getPosition().position;
7. PVector recordedLeftHand2 = recorder.trackedJoints[3].getPosition().position;
8. PVector recordedRightShoulder2 = recorder.trackedJoints[4].getPosition().position;
9. PVector recordedRightElbow2 = recorder.trackedJoints[5].getPosition().position;
10. PVector recordedRightHand2 = recorder.trackedJoints[6].getPosition().position;
12. saveData(oLeftHand,recordedLeftHand2);
13. saveData(oNeck,recordedNeck2);
14. saveData(oLeftShoulder,recordedLeftShoulder2);
15. saveData(oLeftElbow,recordedLeftElbow2);
16. saveData(oRightShoulder,recordedRightShoulder2);
17. saveData(oRightElbow,recordedRightElbow2);
18. saveData(oRightHand,recordedRightHand2);
20. stop(oNeck);
21. stop(oLeftShoulder);
22. stop(oLeftElbow);
23. stop(oRightShoulder);
24. stop(oRightElbow);
25. stop(oRightHand);
27. recorder.nextFrame();
28. }
29. if(millis() >= timer+5000){
30. timer = millis();
31. recording = !recording;
32. String rows[] = loadStrings("C:\\data\\nameofactivity\\1st\\LeftHand.txt"); //check if we are able to read while the txt is still opened
33. println(rows.length);
34. }
36. void saveData(PrintWriter output, PVector jointID){
37. output.println(jointID.x + " " + jointID.y + " " +jointID.z);
38. }
40. void stop(PrintWriter joint){
41. joint.flush();
42. /////////joint.close();
43. }

how to reset count time

[4 Replies]
- 27-Nov-2012 12:23 AM
- Forum: Programming Questions
I would like to run a program in 5 seconds and then reset the timer back to 0
so the timer will start to count from 0 to 5 seconds again after the new frame..but failed with
the code below..could someone show me what is wrong??
1. void draw(){
2. int m = millis();
3. println(m);
4. if(m == 5000){
5. m = 0;
6. }
7. }

what's the difference using while(true) in void setup and the difference with void draw()

[2 Replies]
- 25-Nov-2012 11:23 PM
- Forum: General Discussion
I dont think this is an appropriate question, but I would like to know the difference using while(true) and void draw()??

Is it possible to have more than 1 output in created function??

[6 Replies]
- 20-Nov-2012 07:43 PM
- Forum: Programming Questions
I would like to have 2 outputs for a function,like for example:

the 2outputs are saved in V and D

[V,D] = float(a,b,c,d);

float(float a, float b, float c, float d){
.....
.....
.....

return E,F;
}

and the result would be E and F are stored in V and D respectively....
Is it possible??
even when returned in a form of 2D array like float[][]??

expecting EOF, found 'columns'..cant figure it out

[6 Replies]
- 20-Nov-2012 06:20 AM
- Forum: Programming Questions
Could somebody help me solving the error??
I couldn't figure it out..
The 1st code will run without any problem..
1. String rows[] = loadStrings("Head.txt"); //read txt files
2. String[] columns;
3. columns = splitTokens(rows[0]); //how many columns in a line in txt file
4. double[][] matrixA = new double[rows.length][columns.length];
5. double[][] transposed_matrixA = new double[columns.length][rows.length];
6. double[][] covariance_matrixA = new double[columns.length][columns.length];
8. double[] Mean = new double[columns.length];
9. double[][] X = new double[columns.length][rows.length];
10. double[][] transposed_X = new double[rows.length][columns.length];
11. //double[][] V = new double[columns.length][columns.length];
12. //double[][] D = new double[columns.length][columns.length];
14. //check the size of input matrix from the .txt file
15. println("there are " + rows.length + " rows");
16. println("there are " + columns.length + " columns");
18. //insert the numbers from txt file into matrixA
19. for (int i =0 ; i<rows.length; i++){
20. columns = splitTokens(rows[i]);
21. for(int j=0; j<columns.length; j++){
22. matrixA[i][j] = Double.parseDouble(columns[j]);
23. transposed_matrixA[j][i] = matrixA[i][j];
24. }
25. }
27. //calculate means for transposed_matrixA.So we have to change rows to columns and vice versa
28. for(int i=0; i<columns.length; i++){
29. double mean = 0.0;
30. for(int j=0; j<rows.length; j++){
31. mean += transposed_matrixA[i][j];
32. }
33. Mean[i] = mean/rows.length;
34. }
36. for(int i=0; i<columns.length; i++){
37. for(int j=0; j<rows.length; j++){
38. X[i][j] = transposed_matrixA[i][j] - Mean[i];
39. transposed_X[j][i] = X[i][j];
40. }
41. }
43. for(int i=0; i<columns.length; i++){
44. for(int j=0; j<columns.length; j++){
45. for(int k=0; k<rows.length; k++){
46. covariance_matrixA[i][j] += X[i][k]*transposed_X[k][j];
47. }
48. covariance_matrixA[i][j] /= rows.length;
49. }
50. }
But when I add a code as below whether in a new tab or below line 50 of above code, I got an error stating " expecting EOF, found 'columns' " that is highlighted at the 3rd line of above code..The weird part is,even i commented out below's code, the error still remains..only when I erase the code that the error will gone..
Help please
1. class jacobi{
2. static final double EPS = pow(10,-6);
3. static final double TINY = pow(10,-20);
4. static final int MAX=ITER = 100;
5. static void kaiten(double[][] a, int i, int j, int k, int l, double c, double s){
6. double x = a[i][j], y = a[k][l];
7. a[i][j] = x*c - y*s;
8. a[k][l] = x*s + y*c;
9. }
11. public static boolean solve(double[][] a, double[][] w){
12. int n = a.length;
13. double s = 0, offdiag = 0;
15. for(int j=0; j<n; j++){
16. for(int k=0; k<n; k++){
17. w[j][k] = 0;
18. }
19. w[j][j] = 1; s += a[j][j] * a[j][j];
20. for(int k = j+1; k<n; k++){
21. offdiag += a[j][k];
22. }
23. }
25. double tolerance = EPS * EPS * (s/2 + offdiag);
26. int iter;
28. for(iter=1; iter<=MAX_ITER; iter++){
29. offdiag = 0;
30. for(int j=0; j<n-1; j++){
31. for(int k=j+1; k<n; k++){
32. offdiag += a[j][k] * a[j][k];
33. }
34. println(iter + " : " + sqrt(2*offdiag / (n*(n-1))));
35. }
37. if(offdiag<tolerance){
38. break;
39. }
40. for(int j=0; j<n-1; j++){
41. for(int k=j+1; k<n; k++){
42. if(abs(a[j][k]) < TINY){
43. continue;
44. }
45. double t = (a[k][k] - a[j][j]) / (2 * a[j][k]);
46. if(t >= 0){
47. t = 1 /(t + sqrt(t*t + 1));
48. }
49. else{
50. t = 1/(t - sqrt(t*t + 1));
51. }
52. double c = 1/sqrt(t*t + 1), u = t*c;
53. t *= a[j][k];
54. a[j][j] -= t; a[k][k] += t; a[j][k] = 0;
55. int i;
56. for(i=0; i<j; i++) {
57. kaiten(a,i,j,i,k,c,u);
58. }
59. for(i=j+1; i<k; i++) {
60. kaiten(a,j,i,i,k,c,u);
61. }
62. for(i=k+1; i<n; i++) {
63. kaiten(a,j,i,k,i,c,u);
64. }
65. for(i=0; i<n; i++) {
66. kaiten(w,j,i,k,i,c,u);
67. }
68. }
69. }
70. }
71. if(iter > MAX_ITER) return false;
72. for(int i=0; i<n-1; i++){
73. int k=i; double t=a[k][k];
74. for(int j=i+1; j<n; j++){
75. if(a[j][j] > t){
76. k=j; t=a[k][k];
77. }
78. }
79. a[k][k] = a[i][i]; a[i][i] = t;
80. double[] v = w[k]; w[k] = w[i]; w[i] = v;
81. }
82. return true;
83. }
84. }

Using EJML or JAMA in Processing

[0 Replies]
- 18-Nov-2012 05:26 AM
- Forum: Contributed Library Questions
Have anyone here tried using this library??
If you have could you please help me on calculating eigenvalues and eigenvectors??
for EJML
I dont understand on how to use the SimpleMatrix or the DenseMatrix64F..
how to even create a matrix??

which will be better or easier to use for solving eigenvalue problem??
EJML or JAMA??

loading from txt file to matrix(2D array)

[5 Replies]
- 18-Nov-2012 05:19 AM
- Forum: Programming Questions
I would like to insert numbers in txt file "Head.txt" and insert it to a A_matrix but failed with error:
ArrayIndexOutOfBoundsException: 313

my Head.txt will be like for eg.
1 2 3
4 5 6
......
311 312 313

means it takes a form of 313 x 3 matrix..
my code will be as below..
1. BufferedReader reader;
2. String line;
3. int rows=0;
4. double[][] A_matrix = new double[313][3];
6. void setup() {
7. // Open the file from the createWriter() example
8. reader = createReader("Head.txt");
9. }
11. void draw() {
12. try {
13. line = reader.readLine();
14. } catch (IOException e) {
15. e.printStackTrace();
16. line = null;
17. }
18. while(line != null){
19. String[] nums = split(line, ' ');
20. for(int j=0; j<3; j++){
21. A_matrix[rows][j] = Double.parseDouble(nums[j]);
22. }
23. rows++;
24. }
25. }
I know that this is not a good program but I couldnt think of any better..Please help me..
I'll send through email or upload on some hosting webpage if anyone need the file Head.txt

can use 3rd party java library??

[9 Replies]
- 17-Nov-2012 04:24 AM
- Forum: General Discussion
can i use 3rd party java library in processing..??

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