Dispmat: Difference between revisions
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===Purpose=== | ===Purpose=== | ||
Calculates the dispersion matrix of two spectral data sets. | Calculates the dispersion matrix of two spectral data sets. | ||
===Synopsis=== | ===Synopsis=== | ||
:[c,meansx,meansy,stdsx,stdsy] = dispmat(x,y,options); | :[c,meansx,meansy,stdsx,stdsy] = dispmat(x,y,options); | ||
===Description=== | ===Description=== | ||
Calculates a dispersion matrix, as defined by the options, of datasets x and y. | Calculates a dispersion matrix, as defined by the options, of datasets x and y. | ||
* x : (2-way array class "double" or "dataset") x-matrix for dispersion matrix. | ====Inputs==== | ||
* y : (2-way array class "double" or "dataset") y-matrix for dispersion matrix. | |||
* '''x''' : (2-way array class "double" or "dataset") x-matrix for dispersion matrix. | |||
* c : dispersion matrix, as defined by options. | |||
* meansx : mean of x. | * '''y''' : (2-way array class "double" or "dataset") y-matrix for dispersion matrix. | ||
* meansy : mean of y. | |||
* stdsx : standard deviation of x. | ====Outputs==== | ||
* stdsy : standard deviation of y. | |||
* '''c''' : dispersion matrix, as defined by options. | |||
* '''meansx''' : mean of x. | |||
* '''meansy''' : mean of y. | |||
* '''stdsx''' : standard deviation of x. | |||
* '''stdsy''' : standard deviation of y. | |||
===Options=== | ===Options=== | ||
* offsetx : [0] offset for x. | |||
* offsety : [0] offset for y. | * '''offsetx''' : [0] offset for x. | ||
* dispersion : [1] dispersion matrix calculated: | |||
* 1: standardized, offset corrected | * '''offsety''' : [0] offset for y. | ||
* 2: length sqrt(nrows), offset corrected | |||
* 3: purity about mean, offset corrected | * '''dispersion''' : [1] dispersion matrix calculated: | ||
* 4: purity about origin, offset corrected | |||
* 5: asynchronous, offset corrected | * '''1''': standardized, offset corrected | ||
* '''2''': length sqrt(nrows), offset corrected | |||
* '''3''': purity about mean, offset corrected | |||
* '''4''': purity about origin, offset corrected | |||
* '''5''': asynchronous, offset corrected | |||
===See Also=== | ===See Also=== | ||
[[corrspec]], [[corrspecengine]], [[purity]] | [[corrspec]], [[corrspecengine]], [[purity]] | ||
Latest revision as of 17:33, 3 September 2008
Purpose
Calculates the dispersion matrix of two spectral data sets.
Synopsis
- [c,meansx,meansy,stdsx,stdsy] = dispmat(x,y,options);
Description
Calculates a dispersion matrix, as defined by the options, of datasets x and y.
Inputs
- x : (2-way array class "double" or "dataset") x-matrix for dispersion matrix.
- y : (2-way array class "double" or "dataset") y-matrix for dispersion matrix.
Outputs
- c : dispersion matrix, as defined by options.
- meansx : mean of x.
- meansy : mean of y.
- stdsx : standard deviation of x.
- stdsy : standard deviation of y.
Options
- offsetx : [0] offset for x.
- offsety : [0] offset for y.
- dispersion : [1] dispersion matrix calculated:
- 1: standardized, offset corrected
- 2: length sqrt(nrows), offset corrected
- 3: purity about mean, offset corrected
- 4: purity about origin, offset corrected
- 5: asynchronous, offset corrected