In[]:=
CF=SparseArray
Specified elements: 10
Dimensions: {10,10}
​​
Out[]=
SparseArray
Specified elements: 10
Dimensions: {10,10}
Default: 0
Density: 0.1
Elements:
{1,1}
2.64x
{2,2}
2.64x
{3,3}
2.18x
{4,4}
2.18x
⋮

f[x_]:=Evaluate[CF]​​f[y]
Out[]=
SparseArray
Specified elements: 10
Dimensions: {10,10}
Default: 0
Density: 0.1
Elements:
{1,1}
2.64x
{2,2}
2.64x
{3,3}
2.18x
{4,4}
2.18x
⋮
