How to get from a file.txt the array that I need? (in Xcode)
0
I don't know if it's possible.
In my app I am saving a list of arrays in a file.txt. (e.g.:
2012-09-02 16:27:15.010 SMAccelerometerDataLogger[1950:707] -0.818863 0.286575 0.206177
2012-09-02 16:27:15.017 SMAccelerometerDataLogger[1950:707] -1.024597 0.380875 0.456131
2012-09-02 16:27:15.023 SMAccelerometerDataLogger[1950:707] -0.754196 0.417053 1.165237
...
and I need (the first numbers array):
-0.818863
-1.024597
0.754196
e.g in Gnuplot it is possible
plot "file.txt"using 2:7
I need this array to filter it by FFT, here is my code:
int SIZE = 97;
fftw_complex *data, *fft_result, *ifft_result;
fftw_plan plan_forward, plan_backward;
int i;
data = (fftw_complex*) fftw_malloc(sizeof(fftw_complex) * SIZE);
fft_result = (fftw_complex*) fftw_malloc(sizeof(fftw_complex) * SIZE);
ifft_result = (fftw_complex*) fftw_malloc(sizeof(fftw_complex) * SIZE);
plan_forward = fftw_plan_dft_1d(SIZE, data, fft_result,
FFTW_FORWARD, FFTW_ESTIMATE);
plan_backward = fftw_plan_dft_1d(SIZE, fft_result, ifft_result,
FFTW_BACKWARD, FFTW_ESTIMATE);
for( i = 0 ; i < SIZE ; i++ ) {
data[i][0] = array[i][0];//>>>> here i should use the array that i need
data[i][1] = 0.0;
}
for( i = 0 ; i < SIZE ; i++ ) {
fprintf( stdout, "data[%d] = { %2.2f, %2.2f }n",
i, data[i][0], data[i][1] );
}
fftw_execute( plan_forward );
for( i = 0 ; i < SIZE ; i++ ) {
fprintf( stdout, "fft_result[%d] = { %2.2f, %2.2f }n",
i, fft_result[i][0], fft_result[i][1] );
}
fftw_execute( plan_backward );
for( i = 0 ; i < SIZE ; i++ ) {
fprintf( stdout, "ifft_result[%d] = { %2.2f, %2.2f }n",
i, ifft_result[i][0] / SIZE, ifft_result[i][1] / SIZE );
}
fftw_destroy_plan( plan_forward );
fftw_destroy_plan( plan_backward );
fftw_free( data );
fftw_free( fft_result );
fftw_free( ifft_result );
is it possible? how?
arrays xcode
edited Dec 29 '18 at 8:28
Cœur
17.6k9105145
asked May 19 '14 at 22:50
josefjosef
1,5771516
add a comment |
0
I don't know if it's possible.
In my app I am saving a list of arrays in a file.txt. (e.g.:
2012-09-02 16:27:15.010 SMAccelerometerDataLogger[1950:707] -0.818863 0.286575 0.206177
2012-09-02 16:27:15.017 SMAccelerometerDataLogger[1950:707] -1.024597 0.380875 0.456131
2012-09-02 16:27:15.023 SMAccelerometerDataLogger[1950:707] -0.754196 0.417053 1.165237
...
and I need (the first numbers array):
-0.818863
-1.024597
0.754196
e.g in Gnuplot it is possible
plot "file.txt"using 2:7
I need this array to filter it by FFT, here is my code:
int SIZE = 97;
fftw_complex *data, *fft_result, *ifft_result;
fftw_plan plan_forward, plan_backward;
int i;
data = (fftw_complex*) fftw_malloc(sizeof(fftw_complex) * SIZE);
fft_result = (fftw_complex*) fftw_malloc(sizeof(fftw_complex) * SIZE);
ifft_result = (fftw_complex*) fftw_malloc(sizeof(fftw_complex) * SIZE);
plan_forward = fftw_plan_dft_1d(SIZE, data, fft_result,
FFTW_FORWARD, FFTW_ESTIMATE);
plan_backward = fftw_plan_dft_1d(SIZE, fft_result, ifft_result,
FFTW_BACKWARD, FFTW_ESTIMATE);
for( i = 0 ; i < SIZE ; i++ ) {
data[i][0] = array[i][0];//>>>> here i should use the array that i need
data[i][1] = 0.0;
}
for( i = 0 ; i < SIZE ; i++ ) {
fprintf( stdout, "data[%d] = { %2.2f, %2.2f }n",
i, data[i][0], data[i][1] );
}
fftw_execute( plan_forward );
for( i = 0 ; i < SIZE ; i++ ) {
fprintf( stdout, "fft_result[%d] = { %2.2f, %2.2f }n",
i, fft_result[i][0], fft_result[i][1] );
}
fftw_execute( plan_backward );
for( i = 0 ; i < SIZE ; i++ ) {
fprintf( stdout, "ifft_result[%d] = { %2.2f, %2.2f }n",
i, ifft_result[i][0] / SIZE, ifft_result[i][1] / SIZE );
}
fftw_destroy_plan( plan_forward );
fftw_destroy_plan( plan_backward );
fftw_free( data );
fftw_free( fft_result );
fftw_free( ifft_result );
is it possible? how?
arrays xcode
edited Dec 29 '18 at 8:28
Cœur
17.6k9105145
asked May 19 '14 at 22:50
josefjosef
1,5771516
add a comment |
0
0
0
I don't know if it's possible.
In my app I am saving a list of arrays in a file.txt. (e.g.:
2012-09-02 16:27:15.010 SMAccelerometerDataLogger[1950:707] -0.818863 0.286575 0.206177
2012-09-02 16:27:15.017 SMAccelerometerDataLogger[1950:707] -1.024597 0.380875 0.456131
2012-09-02 16:27:15.023 SMAccelerometerDataLogger[1950:707] -0.754196 0.417053 1.165237
...
and I need (the first numbers array):
-0.818863
-1.024597
0.754196
e.g in Gnuplot it is possible
plot "file.txt"using 2:7
I need this array to filter it by FFT, here is my code:
int SIZE = 97;
fftw_complex *data, *fft_result, *ifft_result;
fftw_plan plan_forward, plan_backward;
int i;
data = (fftw_complex*) fftw_malloc(sizeof(fftw_complex) * SIZE);
fft_result = (fftw_complex*) fftw_malloc(sizeof(fftw_complex) * SIZE);
ifft_result = (fftw_complex*) fftw_malloc(sizeof(fftw_complex) * SIZE);
plan_forward = fftw_plan_dft_1d(SIZE, data, fft_result,
FFTW_FORWARD, FFTW_ESTIMATE);
plan_backward = fftw_plan_dft_1d(SIZE, fft_result, ifft_result,
FFTW_BACKWARD, FFTW_ESTIMATE);
for( i = 0 ; i < SIZE ; i++ ) {
data[i][0] = array[i][0];//>>>> here i should use the array that i need
data[i][1] = 0.0;
}
for( i = 0 ; i < SIZE ; i++ ) {
fprintf( stdout, "data[%d] = { %2.2f, %2.2f }n",
i, data[i][0], data[i][1] );
}
fftw_execute( plan_forward );
for( i = 0 ; i < SIZE ; i++ ) {
fprintf( stdout, "fft_result[%d] = { %2.2f, %2.2f }n",
i, fft_result[i][0], fft_result[i][1] );
}
fftw_execute( plan_backward );
for( i = 0 ; i < SIZE ; i++ ) {
fprintf( stdout, "ifft_result[%d] = { %2.2f, %2.2f }n",
i, ifft_result[i][0] / SIZE, ifft_result[i][1] / SIZE );
}
fftw_destroy_plan( plan_forward );
fftw_destroy_plan( plan_backward );
fftw_free( data );
fftw_free( fft_result );
fftw_free( ifft_result );
is it possible? how?
arrays xcode
edited Dec 29 '18 at 8:28
Cœur
17.6k9105145
asked May 19 '14 at 22:50
josefjosef
1,5771516
I don't know if it's possible.
In my app I am saving a list of arrays in a file.txt. (e.g.:
2012-09-02 16:27:15.010 SMAccelerometerDataLogger[1950:707] -0.818863 0.286575 0.206177
2012-09-02 16:27:15.017 SMAccelerometerDataLogger[1950:707] -1.024597 0.380875 0.456131
2012-09-02 16:27:15.023 SMAccelerometerDataLogger[1950:707] -0.754196 0.417053 1.165237
...
and I need (the first numbers array):
-0.818863
-1.024597
0.754196
e.g in Gnuplot it is possible
plot "file.txt"using 2:7
I need this array to filter it by FFT, here is my code:
int SIZE = 97;
fftw_complex *data, *fft_result, *ifft_result;
fftw_plan plan_forward, plan_backward;
int i;
data = (fftw_complex*) fftw_malloc(sizeof(fftw_complex) * SIZE);
fft_result = (fftw_complex*) fftw_malloc(sizeof(fftw_complex) * SIZE);
ifft_result = (fftw_complex*) fftw_malloc(sizeof(fftw_complex) * SIZE);
plan_forward = fftw_plan_dft_1d(SIZE, data, fft_result,
FFTW_FORWARD, FFTW_ESTIMATE);
plan_backward = fftw_plan_dft_1d(SIZE, fft_result, ifft_result,
FFTW_BACKWARD, FFTW_ESTIMATE);
for( i = 0 ; i < SIZE ; i++ ) {
data[i][0] = array[i][0];//>>>> here i should use the array that i need
data[i][1] = 0.0;
}
for( i = 0 ; i < SIZE ; i++ ) {
fprintf( stdout, "data[%d] = { %2.2f, %2.2f }n",
i, data[i][0], data[i][1] );
}
fftw_execute( plan_forward );
for( i = 0 ; i < SIZE ; i++ ) {
fprintf( stdout, "fft_result[%d] = { %2.2f, %2.2f }n",
i, fft_result[i][0], fft_result[i][1] );
}
fftw_execute( plan_backward );
for( i = 0 ; i < SIZE ; i++ ) {
fprintf( stdout, "ifft_result[%d] = { %2.2f, %2.2f }n",
i, ifft_result[i][0] / SIZE, ifft_result[i][1] / SIZE );
}
fftw_destroy_plan( plan_forward );
fftw_destroy_plan( plan_backward );
fftw_free( data );
fftw_free( fft_result );
fftw_free( ifft_result );
is it possible? how?
arrays xcode
arrays xcode
edited Dec 29 '18 at 8:28
Cœur
17.6k9105145
asked May 19 '14 at 22:50
josefjosef
1,5771516
edited Dec 29 '18 at 8:28
Cœur
17.6k9105145
asked May 19 '14 at 22:50
josefjosef
1,5771516
edited Dec 29 '18 at 8:28
Cœur
17.6k9105145
edited Dec 29 '18 at 8:28
Cœur
17.6k9105145
edited Dec 29 '18 at 8:28
Cœur
17.6k9105145
17.6k9105145
asked May 19 '14 at 22:50
josefjosef
1,5771516
asked May 19 '14 at 22:50
josefjosef
1,5771516
asked May 19 '14 at 22:50
josefjosef
1,5771516
1,5771516
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
0
If the format is always the same then you could split the string by the known delimiter in this case you could get that column of data using something like:
NSArray *components = [line componentsSeparatedByString:@" "];
if (components.count > 3) {
NSLog(@"%@", components[3]);
}
answered May 19 '14 at 22:57
Paul.sPaul.s
35.9k55782
thank you for helping. where should i write the path of the file that i have (file.txt)? and its showing me an error for[line componentsSeparatedByString:@" "];> use of undeclared identifier "line"; did you mean "link"?
– josef
May 19 '14 at 23:22
any idea how to solve this error?
– josef
May 20 '14 at 17:05
For efficiently reading a file line by line check out this great answer stackoverflow.com/questions/3707427/…
– Paul.s
May 20 '14 at 19:38
thank you, i read it, even that it is for reading lines , i could complete my code from there. :) but i am getting now null please take a look on my new Question : link
– josef
May 20 '14 at 21:37
add a comment |
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1 Answer
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1 Answer
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active
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0
If the format is always the same then you could split the string by the known delimiter in this case you could get that column of data using something like:
NSArray *components = [line componentsSeparatedByString:@" "];
if (components.count > 3) {
NSLog(@"%@", components[3]);
}
answered May 19 '14 at 22:57
Paul.sPaul.s
35.9k55782
thank you for helping. where should i write the path of the file that i have (file.txt)? and its showing me an error for[line componentsSeparatedByString:@" "];> use of undeclared identifier "line"; did you mean "link"?
– josef
May 19 '14 at 23:22
any idea how to solve this error?
– josef
May 20 '14 at 17:05
For efficiently reading a file line by line check out this great answer stackoverflow.com/questions/3707427/…
– Paul.s
May 20 '14 at 19:38
thank you, i read it, even that it is for reading lines , i could complete my code from there. :) but i am getting now null please take a look on my new Question : link
– josef
May 20 '14 at 21:37
add a comment |
0
If the format is always the same then you could split the string by the known delimiter in this case you could get that column of data using something like:
NSArray *components = [line componentsSeparatedByString:@" "];
if (components.count > 3) {
NSLog(@"%@", components[3]);
}
answered May 19 '14 at 22:57
Paul.sPaul.s
35.9k55782
thank you for helping. where should i write the path of the file that i have (file.txt)? and its showing me an error for[line componentsSeparatedByString:@" "];> use of undeclared identifier "line"; did you mean "link"?
– josef
May 19 '14 at 23:22
any idea how to solve this error?
– josef
May 20 '14 at 17:05
For efficiently reading a file line by line check out this great answer stackoverflow.com/questions/3707427/…
– Paul.s
May 20 '14 at 19:38
thank you, i read it, even that it is for reading lines , i could complete my code from there. :) but i am getting now null please take a look on my new Question : link
– josef
May 20 '14 at 21:37
add a comment |
0
0
0
If the format is always the same then you could split the string by the known delimiter in this case you could get that column of data using something like:
NSArray *components = [line componentsSeparatedByString:@" "];
if (components.count > 3) {
NSLog(@"%@", components[3]);
}
answered May 19 '14 at 22:57
Paul.sPaul.s
35.9k55782
If the format is always the same then you could split the string by the known delimiter in this case you could get that column of data using something like:
NSArray *components = [line componentsSeparatedByString:@" "];
if (components.count > 3) {
NSLog(@"%@", components[3]);
}
answered May 19 '14 at 22:57
Paul.sPaul.s
35.9k55782
answered May 19 '14 at 22:57
Paul.sPaul.s
35.9k55782
answered May 19 '14 at 22:57
Paul.sPaul.s
35.9k55782
answered May 19 '14 at 22:57
Paul.sPaul.s
35.9k55782
35.9k55782
thank you for helping. where should i write the path of the file that i have (file.txt)? and its showing me an error for[line componentsSeparatedByString:@" "];> use of undeclared identifier "line"; did you mean "link"?
– josef
May 19 '14 at 23:22
any idea how to solve this error?
– josef
May 20 '14 at 17:05
For efficiently reading a file line by line check out this great answer stackoverflow.com/questions/3707427/…
– Paul.s
May 20 '14 at 19:38
thank you, i read it, even that it is for reading lines , i could complete my code from there. :) but i am getting now null please take a look on my new Question : link
– josef
May 20 '14 at 21:37
add a comment |
thank you for helping. where should i write the path of the file that i have (file.txt)? and its showing me an error for[line componentsSeparatedByString:@" "];> use of undeclared identifier "line"; did you mean "link"?
– josef
May 19 '14 at 23:22
any idea how to solve this error?
– josef
May 20 '14 at 17:05
For efficiently reading a file line by line check out this great answer stackoverflow.com/questions/3707427/…
– Paul.s
May 20 '14 at 19:38
thank you, i read it, even that it is for reading lines , i could complete my code from there. :) but i am getting now null please take a look on my new Question : link
– josef
May 20 '14 at 21:37
thank you for helping. where should i write the path of the file that i have (file.txt)? and its showing me an error for
[line componentsSeparatedByString:@" "]; > use of undeclared identifier "line"; did you mean "link"?– josef
May 19 '14 at 23:22
thank you for helping. where should i write the path of the file that i have (file.txt)? and its showing me an error for
[line componentsSeparatedByString:@" "]; > use of undeclared identifier "line"; did you mean "link"?– josef
May 19 '14 at 23:22
any idea how to solve this error?
– josef
May 20 '14 at 17:05
any idea how to solve this error?
– josef
May 20 '14 at 17:05
For efficiently reading a file line by line check out this great answer stackoverflow.com/questions/3707427/…
– Paul.s
May 20 '14 at 19:38
For efficiently reading a file line by line check out this great answer stackoverflow.com/questions/3707427/…
– Paul.s
May 20 '14 at 19:38
thank you, i read it, even that it is for reading lines , i could complete my code from there. :) but i am getting now null please take a look on my new Question : link
– josef
May 20 '14 at 21:37
thank you, i read it, even that it is for reading lines , i could complete my code from there. :) but i am getting now null please take a look on my new Question : link
– josef
May 20 '14 at 21:37
add a comment |
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