The pictorial representation of pictorial function is:
![](https://static.packt-cdn.com/products/9781789612011/graphics/assets/d0546d3d-830b-4817-92a3-4df6b07327d1.png)
The sphere function
The pictorial representation of pictorial function is:
Dimensions: d
The sphere function has d local minima except for the global one. It is continuous, convex, and unimodal. The plot shows its two-dimensional form.
The function is usually evaluated on the xi ∈ [-5.12, 5.12] hypercube, for all i = 1, …, d.