cannot be sent to an abstract object of class

[Shane]

I get the error below when trying to assign a new value (compile
error) to rate in myMethod. Why is this NSNumber considered abstract?
I would like to give it a new value.

@interface
{
        NSNumber *rate;
        // ...
}
// ...
#end

- (id) init
{
        // …
        rate = [[NSNumber alloc] initWithFloat:0.0];
        // now has retain count of 1
}

- (void) myMethod
{
        // ...
        [rate initWithFloat:[[config rate] floatValue]];
        // …
}

*** initialization method -initWithFloat: cannot be sent to an
abstract object of class NSCFNumber: Create a concrete instance!
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