private static SimpleFloat3 loadFC() {
System.out.print("loading ... ");
int nx = 256;
int ny = 256;
// int nz = 1000;
int nz = 1000;
int kz = 2000;
SimpleFloat3 sf3;
try {
ArrayFile af = new ArrayFile(DATA_DIR + "CS_patient/CS_matrix.imgs", "r");
// ArrayFile af =
// new ArrayFile(DATA_DIR+"FC_patient/FC_2000_2999.imgs","r");
af.seek(175 + kz * nx * ny);
byte[][][] b = zerobyte(nx, ny, nz);
af.readBytes(b);
float[][][] f = zerofloat(nz, ny, nx);
for (int ix = 0; ix < nx; ++ix) {
for (int iy = 0; iy < ny; ++iy) {
for (int iz = 0; iz < nz; ++iz) {
int i = b[iz][iy][ix];
if (i < 0) i += 256;
f[ix][iy][iz] = (float) i;
}
}
}
sf3 = new SimpleFloat3(f);
} catch (IOException ioe) {
throw new RuntimeException(ioe);
}
System.out.println("done");
return sf3;
}
private static void bench(ByteOrder order) {
System.out.println("order=" + order);
int n = 1000000;
try {
File file = File.createTempFile("junk", "dat");
file.deleteOnExit();
ArrayFile af = new ArrayFile(file, "rw", order, order);
benchFloat(af, n);
benchDouble(af, n);
af.close();
} catch (IOException ioe) {
throw new RuntimeException(ioe);
}
}
private static void benchDouble(ArrayFile af, int n) throws IOException {
double[] a = randdouble(n);
double[] b = zerodouble(n);
int nio;
Stopwatch sw = new Stopwatch();
sw.start();
for (nio = 0; sw.time() < 5.0; ++nio) {
af.seek(0);
af.writeDoubles(a);
af.seek(0);
af.readDoubles(b);
}
sw.stop();
for (int i = 0; i < n; ++i) if (a[i] != b[i]) throw new RuntimeException("double: i/o failure");
double time = sw.time();
double rate = 2.0 * 8.0e-6 * nio * n / time;
System.out.println("double: rate=" + rate + " MB/s");
}