I am not sure where I am going wrong.
The file I am trying to read:
1 1 1 1 1 1 1 2 2 2
2 3 3 3 3 4 4 5 5 5
5 5 5 5 5 6 6 6 7 7
7 8 8 8 9 9 9 9 9 9
10 10 11 11 11 12 12 12 12 12
12 13 13 13 14 14 14 15 15 15
15 15 15 16 16 16 16 17 18 18
18 18 18 19 19 19 19 19 19 20
20 20 20 20 20 21 21 21 21 21
22 22 23 23 24 25 25 25 26 26
This is my code:
#include<stdio.h>
using namespace std;
int main(){
FILE *fptr;
char FILENAME[100];
printf("Enter the name of the file:");
gets(FILENAME);
fptr=fopen(FILENAME,"r");
if(fptr==NULL){
printf("File could not be opened");
}
int count=0,space=0;
while ((count = fgetc(fptr)) != EOF)
{
if (count == ' ')
space++;
}
printf("Number of integers in file: %d \n\n",space);
int storedData[space];
for(int i=0;i<space;i++){
fscanf(fptr,"%d", &storedData[i]);
}
for(int i=0;i<space;i++){
printf("%d \n", storedData[i]);
}
return 0;
} ```
**Output**
Enter the name of the file:Listofnumbers.dat
Number of integers in file: 100
0
0
0
0
-810195648
22737
-83690506
32763
10904080
0
34
0
-83207872
32763
56
0
0
0
0
0
34
0
-83690617
32763
1
0
0
0
1
0
0
0
0
0
-83696309
32763
0
0
0
0
8
0
16
0
34
0
-83529122
32763
1
0
-83232208
32763
0
0
-810189776
22737
34
0
-83479343
32763
-83232208
32763
-83232208
32763
6421816
0
-83232208
32763
34
0
-83522581
32763
6421808
0
-83232208
32763
1
0
-83232208
32763
-83232112
32763
70
0
10884048
0
400
0
4199998
0
4210744
0
100
0
-83207872
32763
6421512
0
Check the return value from fscanf().
Rewind the file before trying to reread it.
Never use gets(), either — it is far too dangerous.
Related
I'm traying to read from a file two things :
1- a list of integers(on the top of the file) in to an array of integers inputs[]
2- 3 matrixes 5x5 etch into an array of array of array boards[][][]
the firs part works properly but when the 2 part finished some how the inputs[] change values
The code :
void loadfile(const char* filepath,int *inputs ,int boards [nboards][size][size]){
FILE *inp=fopen(filepath,"r");
//loading the marked numbers
for(int i=0;i<4;i++){
fscanf(inp,"%d",inputs+i);
//to show that inputs reseve the the right values at the start
printf("%d ",*(inputs+i));
fseek(inp,ftell(inp)+1,SEEK_SET);
}
printf("\n");
//loaing the boards
for(int n=1;n<=nboards;n++){
for(int i=0;i<size;i++)
for(int j=0;j<size;j++){
fscanf(inp,"%d",&boards[n][i][j]);
printf("%d ",boards[n][i][j]);
}
printf("\n");
}
fclose(inp);
}
int main(){
int inputs[4]={};
int boards[nboards][size][size]={};
loadfile("inputs.txt",inputs,boards);
for(int i=0;i<4;i++)
printf("%d ",*(inputs+i));
}
The file :
7,4,9,5
22 13 17 11 0
8 2 23 4 24
21 9 14 16 7
6 10 3 18 5
1 12 20 15 19
3 15 0 2 22
9 18 13 17 5
19 8 7 25 23
20 11 10 24 4
14 21 16 12 6
14 21 17 24 4
10 16 15 9 19
18 8 23 26 20
22 11 13 6 5
2 0 12 3 7
The output:
7 4 9 5
22 13 17 11 0 8 2 23 4 24 21 9 14 16 7 6 10 3 18 5 1 12 20 15 19
3 15 0 2 22 9 18 13 17 5 19 8 7 25 23 20 11 10 24 4 14 21 16 12 6
14 21 17 24 4 10 16 15 9 19 18 8 23 26 20 22 11 13 6 5 2 0 12 3 7
21 17 24 4
In my code I am trying to read values from a .txt file so as to build my adjacency matrix but it keeps on returning a segmentation fault. I don't seem to be able to point out where I am going wrong. Please help.
#include <stdio.h>
#include <unistd.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
#include <sys/time.h>
#include <math.h>
#include <limits.h>
#include <iostream>
#define MAX_VERTICES 1024
int global_adj_matrix[MAX_VERTICES][MAX_VERTICES];
int **graph_tree;
int **node_data;
int global_weight;
int number_threads;
int max_nodes;
int random_node;
int max_weight;
int finish_flag;
void readAdjMatrix();
int main(int argc, char *argv[]){
for(int i = 0 ; i < MAX_VERTICES ; i++){
for(int j = 0 ; j < MAX_VERTICES ; j++){
global_adj_matrix[i][j] = 0;
}
}
number_threads = atoi(argv[1]);
max_nodes = 0;
readAdjMatrix();
}
void readAdjMatrix(){
int source, destination, edge_weight;
max_nodes = INT_MIN;
max_weight = INT_MIN;
FILE *file_pointer = fopen("graph.txt", "r");
while(!feof(file_pointer)){
fscanf(file_pointer, "%d", &source);
fscanf(file_pointer, "%d", &destination);
fscanf(file_pointer, "%d", &edge_weight);
global_adj_matrix[source][destination] = edge_weight;
global_adj_matrix[destination][source] = edge_weight;
if(edge_weight > max_weight)
max_weight = edge_weight;
if(destination > max_nodes)
max_nodes = destination;
}
printf("%d %d", max_weight, max_nodes);
for(int i = 0 ; i <= max_nodes ; i++){
for(int j = 0 ; j <= max_nodes ; j++){
printf("%d\t", global_adj_matrix[i][j]);
}
printf("\n");
}
fclose(file_pointer);
}
This is my .txt file
0 1 281
0 2 242
0 3 344
0 4 340
0 5 372
0 6 161
0 7 49
0 8 278
0 10 190
0 11 213
0 12 55
0 13 239
0 14 321
0 15 162
1 0 281
1 2 249
1 3 58
1 4 331
1 5 189
1 6 84
1 7 259
1 9 256
1 11 188
1 12 149
1 13 330
1 14 17
1 15 370
2 0 242
2 1 249
2 3 125
2 4 179
2 5 355
2 6 11
2 7 232
2 8 199
2 9 67
2 10 390
2 12 312
2 13 3
2 14 237
2 15 96
3 0 344
3 1 58
3 2 125
3 4 105
3 5 192
3 6 180
3 7 335
3 8 280
3 9 185
3 10 66
3 11 65
3 13 274
3 14 72
3 15 282
4 0 340
4 1 331
4 2 179
4 3 105
4 5 149
4 6 286
4 7 265
4 8 359
4 9 341
4 10 211
4 11 367
4 12 340
4 13 14
4 14 69
4 15 128
5 0 372
5 1 189
5 2 355
5 3 192
5 4 149
5 6 167
5 7 268
5 8 20
5 9 270
5 10 210
5 11 369
5 12 131
5 13 133
5 15 167
6 0 161
6 1 84
6 2 11
6 3 180
6 4 286
6 5 167
6 7 208
6 8 335
6 9 353
6 10 12
6 11 307
6 12 199
6 13 273
6 14 118
7 0 49
7 1 259
7 2 232
7 3 335
7 4 265
7 5 268
7 6 208
7 8 182
7 9 327
7 10 272
7 11 198
7 12 103
7 13 132
7 15 161
8 0 278
8 2 199
8 3 280
8 4 359
8 5 20
8 6 335
8 7 182
8 9 108
8 10 112
8 11 344
8 12 192
8 13 264
8 14 207
8 15 231
9 1 256
9 2 67
9 3 185
9 4 341
9 5 270
9 6 353
9 7 327
9 8 108
9 10 395
9 11 205
9 12 365
9 13 8
9 14 57
9 15 132
10 0 190
10 2 390
10 3 66
10 4 211
10 5 210
10 6 12
10 7 272
10 8 112
10 9 395
10 11 11
10 12 7
10 13 288
10 14 143
10 15 226
11 0 213
11 1 188
11 3 65
11 4 367
11 5 369
11 6 307
11 7 198
11 8 344
11 9 205
11 10 11
11 12 203
11 13 136
11 14 252
11 15 168
12 0 55
12 1 149
12 2 312
12 4 340
12 5 131
12 6 199
12 7 103
12 8 192
12 9 365
12 10 7
12 11 203
12 13 90
12 14 344
12 15 11
13 0 239
13 1 330
13 2 3
13 3 274
13 4 14
13 5 133
13 6 273
13 7 132
13 8 264
13 9 8
13 10 288
13 11 136
13 12 90
13 14 39
13 15 39
14 0 321
14 1 17
14 2 237
14 3 72
14 4 69
14 6 118
14 8 207
14 9 57
14 10 143
14 11 252
14 12 344
14 13 39
14 15 154
15 0 162
15 1 370
15 2 96
15 3 282
15 4 128
15 5 167
15 7 161
15 8 231
15 9 132
15 10 226
15 11 168
15 12 11
15 13 39
15 14 154
Your segmentation fault is because you're trying to read a nonexistent index in the argument vector of main. If you want to avoid that, you should rewrite it to match something like this:
int main (int argc, const char *argv[]) {
if (argc > 1 && (number_threads = atoi(argv[1]))) {
max_nodes = 0;
readAdjMatrix();
}
return 0;
}
This ensures that you have an argument to convert to begin with, and also that it is a nonzero number. I believe atoi has undefined behavior if it isn't a valid string though, so you should harden against that. You also do some other unnecessary things. For one, this block here:
for(int i = 0 ; i < MAX_VERTICES ; i++){
for(int j = 0 ; j < MAX_VERTICES ; j++){
global_adj_matrix[i][j] = 0;
}
}
is pointless because if you initialize a 2D array as an external/global variable then it is automatically zeroed upon initialization. Only local/automatic variables will be filled with garbage data. Therefore, you can omit it.
Finally, I would also change your while loop to look more or less like this (Credit: Chux for better loop guard).
while(fscanf(file_pointer, "%d %d %d", &source, &destination, &edge_weight) == 3) {
global_adj_matrix[source][destination] = global_adj_matrix[destination][source] = edge_weight;
if(edge_weight > max_weight)
max_weight = edge_weight;
if(destination > max_nodes)
max_nodes = destination;
}
This ensures you correctly scanned the amount of variables necessary per line. And the extended assignment just saves a bit of room.
Hope this fixed the problem you were having.
I am posting my answer by neglecting the bigger code which you have not mentioned in your question. I have trimmed down the unnecessary code. The code is given below.
#include <stdio.h>
#include <unistd.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include <limits.h>
#define MAX_VERTICES 1024
int global_adj_matrix[MAX_VERTICES][MAX_VERTICES];
int global_weight,max_nodes,random_node,max_weight;
void readAdjMatrix();
int main()
{
int i,j;
max_nodes = 0;
readAdjMatrix();
return 0;
}
void readAdjMatrix()
{
int source, destination, edge_weight,i,j;
max_nodes = INT_MIN;
max_weight = INT_MIN;
FILE *file_pointer = fopen("graph.txt", "r");
while(!feof(file_pointer))
{
fscanf(file_pointer, "%d", &source);
fscanf(file_pointer, "%d", &destination);
fscanf(file_pointer, "%d", &edge_weight);
global_adj_matrix[source][destination] = global_adj_matrix[destination][source] =edge_weight;
if(destination > max_nodes)
max_nodes = destination;
}
printf( "%d\n", max_nodes);
for( i = 0 ; i <= max_nodes ; i++){
for( j = 0 ; j <= max_nodes ; j++){
printf("%d\t", global_adj_matrix[i][j]);
}
printf("\n");
}
fclose(file_pointer);
}
PS : Simply execute this code with ./a.out with no command line argument. In case you are using the command line argument (as given in your question), please use the following syntax to execute your code :
./a.out "your desired number which works with the bigger code"
Reading a file in c with .csv as extension. The file consisting of both integer and float type data values. Is there any way to read the csv file. Any help is appreciated.
The data is as follows:
Application_No. Actual_Effort (in PM) No of Processes No of Tasks No of partnerLinks Task Variables Element Variables Event Variables Script Developer's Skills Developer's Confidence TPSS TS TCC
1 918.28 1 3 5 33 7 2 3 3.5 1 8 135 143
2 8891.513 3 9 3 100 15 6 12 3 1 36 1197 1233
3 22479.261 5 15 23 125 25 10 20 3 1 190 2700 2890
4 2961.131 2 4 9 70 13 4 17 2 0 72 416 488
5 19650.198 7 14 19 130 28 12 5 2.5 0 231 2450 2681
6 377.75 1 2 4 22 8 2 2 3 1 6 68 74
7 2671.93 1 5 12 55 12 6 4 2 0 17 385 402
8 966.15 3 3 6 31 8 5 7 2.5 0 27 153 180
9 3765.81 2 6 17 73 14 2 3 3.5 1 46 552 590
10 7467.11 4 8 21 87 19 13 1 2 0 116 960 1076
I'm working on J.
How can I convert this matrix:
(i.10)*/(i.10)
0 0 0 0 0 0 0 0 0 0
0 1 2 3 4 5 6 7 8 9
0 2 4 6 8 10 12 14 16 18
0 3 6 9 12 15 18 21 24 27
0 4 8 12 16 20 24 28 32 36
0 5 10 15 20 25 30 35 40 45
0 6 12 18 24 30 36 42 48 54
0 7 14 21 28 35 42 49 56 63
0 8 16 24 32 40 48 56 64 72
0 9 18 27 36 45 54 63 72 81
in array?
0 0 0 0 0 0 0 0 0 0 0 1 2 3 4 5 6 7 8 9 . . .
I tried
(i.10)*/(i.10)"0
and then I've added
~.(i.10)*/(i.10)"0
to eliminate doubles, but it doesn't work.
If you want to turn a 2-dimensional table (matrix) into a 1-dimensional list (vector or "array", though in the J world "array" usually means "rectangle with any number [N] of dimensions"), you can use ravel (,):
matrix =: (i.10)*/(i.10)
list =: , matrix
list
0 0 0 0 0 0 0 0 0 0 0 1 2 3 4 5 6 ...
Now using nub (~.) to remove duplicates should work:
~. list
0 1 2 3 4 5 6 7 8 9 10 12 ...
Note that, in J, the shape of an array usually carries important information, so flattening a matrix like this would be fairly unusual. Still, nothing stopping you.
BTW, you can save yourself some keystrokes by using the adverb ~, which will copy the left argument of a dyad to the right side as well, so you could just say:
matrix =: */~ i. 10
and get the same result as (i.10) */ (i.10).
I'm analysing a dataset with some data-mining tools.The response variable has ten levels and I'm trying to create a classifier.
Here comes the problem.When using nnet and bagging function,the result is not that good and the 5th level is even not in the prediction.
I want to use a confusion matrix to analyse the classifier.but as the 5th level is not shown in the prediction I can't get a well-formed matrix.So how can I get a well-formed matrix?i.e. I want a 10*10 matrix.
The confusion matrix:
library("mda")#This is where **confusion** comes from
> confusion(pre.bag$class,CLASS)#here confusion acts like table
true
predicted 1 2 3 4 6 7 8 9 10 5
1 338 9 6 0 5 12 10 1 15 46
2 9 549 1 59 18 0 3 0 0 6
3 18 1 44 0 0 0 2 0 0 4
4 0 1 0 21 0 0 0 0 0 0
6 2 13 0 1 299 2 9 0 0 0
7 5 2 1 0 10 231 6 0 1 0
8 0 0 0 0 0 5 76 0 0 0
9 5 1 0 0 0 0 0 62 0 0
10 7 3 1 0 0 2 1 6 181 16
attr(,"error")
[1] 0.1231743
attr(,"mismatch")
[1] 0.03386642
Try this:
pred <- factor(pre.bag$class, levels=levels(CLASS) )
confusion(pre.bag$class, CLASS)
(Tested with an fda-object.)