aRcl({loc},{dims},{arr})
Returns the array element at location loc for an array arr of dimensions dims
aSto(val,{loc},{dims},{arr})
Returns the array arr of dimensions dims with the value val stored at location loc. To store this
changed array, use
aSto(val,{loc},{dims},{arr})→myarray
newArray({dims})
Returns the list corresponding to an array of dimensions dims
Contract({arr1},{dims1},{arr2},{dims2})
Contracts on the last index of arr1 and the first index of arr2. To contract on other indices, first use
transpos() to transpose the indices, contract, and then transpose the indices back.
Diverg({arr},{dims},{coord},i)
Returns the divergence of arr in the coordinates given by coord with respect to index i
Gradient({arr},{dims},{coord})
Returns the tensor gradient of arr in the coordinates given by coord
Inner({arr},{dims},i1,i2)
Performs an internal inner/dot product on indices i1 and i2 of arr
Outer(f,{arr1},{dims1},{arr2},{dims2})
Performs an outer/tensor/Kronecker product of arr1 and arr2, using the function f to combine elements
of arr1 and arr2. f is usually "*".
Transpos({arr},{dims},i1,i2)
Transposes arr on indices i1 and i2
Christof({g},{coord})
Returns the components of the Christoffel symbol of the 2nd kind for the metric g in coordinates coord
Riemann({g},{coord})
Returns the components of the Riemann tensor for the metric g in coordinates coord
Ricci({g},{coord})
Returns the components of the Ricci tensor for the metric g in coordinates coord
RicciSc({g},{coord})
returns the components of the Ricci scalar for the metric g in coordinates coord
Einstein({g},{coord})
Returns the components of the Einstein tensor for the metric g in coordinates coord
arrays()
Creates a custom menu
aPrint(arr,dims)
Displays nonzero components of the array arr
delElem({list},i)
Returns list with the ith element deleted
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