---
title: "for(lowerBound:upperBound:step:initialBodyArguments:body:name:)"
framework: metalperformanceshadersgraph
role: symbol
role_heading: Instance Method
path: "metalperformanceshadersgraph/mpsgraph/for(lowerbound:upperbound:step:initialbodyarguments:body:name:)"
---

# for(lowerBound:upperBound:step:initialBodyArguments:body:name:)

Adds a for loop operation, The lower and upper bounds specify a half-open range: the range includes the lower bound but does not include the upper bound.

## Declaration

```swift
func `for`(lowerBound: MPSGraphTensor, upperBound: MPSGraphTensor, step: MPSGraphTensor, initialBodyArguments: [MPSGraphTensor], body: @escaping MPSGraphForLoopBodyBlock, name: String?) -> [MPSGraphTensor]
```

## Parameters

- `lowerBound`: Lower bound value of the loop, this is a scalar tensor, this is the index the loop will start with.
- `upperBound`: Upper bound value of the loop, this is a scalar tensor.
- `step`: Step value of the loop, this is a scalar tensor and must be positive.
- `initialBodyArguments`: Initial set of iteration arguments passed to the bodyBlock of the for loop.
- `body`: This block will execute the body of the for loop.
- `name`: Name of operation.

## Return Value

Return Value A valid MPSGraphTensor array with same count and corresponding element types as initialIterationArguments and return types of the for loop.