How to create two-dimensional vector or/and array

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1 
let mut all_elements: Vec::<Vec::<f32>> = vec![vec![0.0,steps],steps]; //dim steps*steps 
//where steps-const defining size of array,which type u32

My attempt like this,but: expected f32, found u32
help: you can cast an u32 to f32, producing the floating point representation of the integer, rounded if necessary: steps as f32rustc(E0308) main.rs(146, 61): expected f32, found u32`

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Vector of the given size is defined with vec![item; size], not vec![item, size] - note the semicolon.

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