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@@ -98,6 +98,37 @@ Function computes second derivative with respect to $`z`$ of 3D real function $`
  * `return` - error code
 
 `d2fdz2` can be the same pointer as `f`, then result overwrites input. 
+### n-th 3D derivative functions:
+```c
+int wderiv_dnfdxn_3d_r(int n, double *f, double *dnfdxn)
+```
+Function computes n-th derivative with respect to $`x`$ of 3D real function $`f(x,y,z)`$: $`(\frac{d^nf}{dx^n})`$.   
+ * `f` - pointer to input function which is array of size [nx*ny*nz]
+ * `dnfdxn` - pointer to output derivative function which is array of size [nx*ny*nz]
+ * `return` - error code
+
+`dnfdxn` can be the same pointer as `f`, then result overwrites input. 
+ 
+```c
+int wderiv_dnfdyn_3d_r(int n, double *f, double *dnfdyn)
+```
+Function computes n-th derivative with respect to $`y`$ of 3D real function $`f(x,y,z)`$: $`(\frac{d^nf}{dy^n})`$.   
+ * `f` - pointer to input function which is array of size [nx*ny*nz]
+ * `dnfdyn` - pointer to output derivative function which is array of size [nx*ny*nz]
+ * `return` - error code
+
+`dnfdyn` can be the same pointer as `f`, then result overwrites input. 
+
+ 
+```c
+int wderiv_dnfdzn_3d_r(int n, double *f, double *dnfdzn)
+```
+Function computes n-th derivative with respect to $`z`$ of 3D real function $`f(x,y,z)`$: $`(\frac{d^nf}{dz^n})`$.   
+ * `f` - pointer to input function which is array of size [nx*ny*nz]
+ * `dnfdzn` - pointer to output derivative function which is array of size [nx*ny*nz]
+ * `return` - error code
+
+`dnfdzn` can be the same pointer as `f`, then result overwrites input. 
 
 /**
  * Function computes gradient