diff

Builtin index · Collections & strings

result = diff(x)

Input: x · Output: result

What it is

x is a numeric Vec or Signal of length N.

Overloads

One call shape — this function is not overloaded.

Code	Input	Output	Description
`result = diff(x)`	`x` Vec or Signalnot documented yet	`result` Signal	Returns the first difference (`x[i+1] - x[i]`), length N-1, same base type as `x`; a `Signal` input stays a `Signal` with the same `Fs`.

Examples

From the documentation, and run by the build -- the output and the figure below are what the engine actually produced. Simplest first.

clean = zeros(200)
for i in 60 to 129
    clean[i] = 1.0
end for
noisy = clean + 0.15 * randn(200, seed = 3)

tv = tv_denoise(noisy, 0.3)
print("total variation {sum(abs(diff(noisy))):.1f} -> {sum(abs(diff(tv))):.1f}")

output

total variation 36.5 -> 2.5

from compressed-sensing