How to get the original matrix from derived matrix?!

Hello!!

I am deriving the matrix of original spectra to make some corrections in all spectra. But after these corrections I need the original matrix. So, how do I get the original matrix back from the derived matrix?

Please, i need help!!

Many thanks for your help!

Jussara

Answer 1

[Star Strider]

I would simply copy the original matrix to a separate variable. Then there is no need to recover it.

[Jussara Roque]

But i need the original matrix with the corrections applied in derived matrix, so isn't simply copy the original matrix.

[Star Strider]

In that instance, I do not know what you are doing, so I do not have enough information to properly Answer your Question.

[Jussara Roque]

I have a matrix without correction of solvent and during the obtainment the spectra happened a displacement of baseline and to correct this problem the matrix was derived and the solvente spectra subtracted. Thus, i need recover it with these corrections of solvent.

I'm deriving the matrix and doing corrections in this matrix derived, but I need the matrix corrected back to original form. I think would be "anti derived', but I don't know how to do this.

[Walter Roberson]

Are you doing some kind of derivative within the meaning of calculus? How are you doing that calculation?

[Star Strider]

I’m sorry but I still don’t understand what you did, what your derived spectra are, or what you want to do.

What is the difference between a copy of the original matrix and the ‘anti-derived’ matrix you want as your result?

[Jussara Roque]

I'm using the savgol for calculate the derived matrix the samples and the spectra the solvent. And to correct the solvent signal, I'm subtracting the spectra of each sample and the spectra the solvent. So, the spectra resulting this operation is obtained derived and I want this new matrix with the original data (without derived but with correction the solvent applied in the derived matrix).

[Walter Roberson]

Star Strider: the "baseline" has been subtracted out. Something akin to:

derived_matrix = f(A);   %for some formula f
[slope, intercept] = do_fitting(derived_matrix);
corrected_derivation = (derived_matrix - intercept)/slope;   %normalize using estimated parameters
corrected_A = f_inverse(corrected_derivation);

That is, representation is extracted from the original matrix, used to calculate a correction factor, the correction is applied to the representation information, and now the corrected representation should be transformed back to the original structure.

At the moment we can't say anything about how to do that back-calculation because we do not know how the representation is calculated.