Shearing transform

Hi, In want to do a shearing transform of 2Q-1Q correlation spectra into a 1Q-1Q type projection. This is possible in NMRpipe using the macro shear.M, and it technically works fine.

The macro is as follows:

shift = slope*(yLoc - offset);

p0 = 0.0; p1 = -360.0*shift;

(void) hilbert( rdata, idata, size );
(void) ift( rdata, idata, size );
(void) phase( rdata, idata, size, p0, p1 );
(void) fft( rdata, idata, size );

Now the "slope" and "offset" are the input. I think the slope value to be input should include somehow also the dwell time in the indirect dimension. However, i cannot figure out which units i should use for time...

Perhaps some of you have experience, could you please guide me therough the process...

Thanks in advance..

shearing transformation

2

No.1 Revision

posted Nov 23 '10 at 09:53

Evgeny Fadeev
577●1

Shearing transform

Hi, In want to do a shearing transform of 2Q-1Q correlation spectra into a 1Q-1Q type projection. This is possible in NMRpipe using the macro shear.M, and it technically works fine.

The macro is as follows:

shift = slope*(yLoc - offset);

p0 = 0.0; p1 = -360.0*shift;

(void) hilbert( rdata, idata, size );
(void) ift( rdata, idata, size );
(void) phase( rdata, idata, size, p0, p1 );
(void) fft( rdata, idata, size );

Now the "slope" and "offset" are the input. I think the slope value to be input should include somehow also the dwell time in the indirect dimension. However, i cannot figure out which units i should use for time...

Perhaps some of you have experience, could you please guide me therough the process...

Thanks in advance..

shearing transformation nmrpipe

3

No.2 Revision

posted Jan 05 '11 at 10:18

Evgeny Fadeev
577●1

How to do a Shearing transformTransform in nmrPipe?

Hi, In want to do a shearing transform of 2Q-1Q correlation spectra into a 1Q-1Q type projection. This is possible in NMRpipe using the macro shear.M, and it technically works fine.

The macro is as follows:

shift = slope*(yLoc - offset);

p0 = 0.0; p1 = -360.0*shift;

(void) hilbert( rdata, idata, size );
(void) ift( rdata, idata, size );
(void) phase( rdata, idata, size, p0, p1 );
(void) fft( rdata, idata, size );

Now the "slope" and "offset" are the input. I think the slope value to be input should include somehow also the dwell time in the indirect dimension. However, i cannot figure out which units i should use for time...

Perhaps some of you have experience, could you please guide me therough the process...

Thanks in advance..

shearing transformation nmrpipe