__Function:__int**gsl_diff_central***(const gsl_function **`f`, double`x`, double *`result`, double *`abserr`)-
This function computes the numerical derivative of the function
`f`at the point`x`using an adaptive central difference algorithm. The derivative is returned in`result`and an estimate of its absolute error is returned in`abserr`.

__Function:__int**gsl_diff_forward***(const gsl_function **`f`, double`x`, double *`result`, double *`abserr`)-
This function computes the numerical derivative of the function
`f`at the point`x`using an adaptive forward difference algorithm. The function is evaluated only at points greater than`x`and at`x`itself. The derivative is returned in`result`and an estimate of its absolute error is returned in`abserr`. This function should be used if @math{f(x)} has a singularity or is undefined for values less than`x`.

__Function:__int**gsl_diff_backward***(const gsl_function **`f`, double`x`, double *`result`, double *`abserr`)-
This function computes the numerical derivative of the function
`f`at the point`x`using an adaptive backward difference algorithm. The function is evaluated only at points less than`x`and at`x`itself. The derivative is returned in`result`and an estimate of its absolute error is returned in`abserr`. This function should be used if @math{f(x)} has a singularity or is undefined for values greater than`x`.

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