interpol | API endpoint definition files , giving you a stub app | REST library

Your "expected" behavior isn't possible: if you have 9 colors, and you take 18 equally spaced interpolated values, only the first and the last value will come from your initial set. To have your initial set as part of the list, you need a multiple minus one.

The input to LinearSegmentedColormap.from_list() can't be rgb values in the range 0-255: they need to be float values in the range 0-1. Also, the N= parameter will be the number of internally stored values. If you set N equal to the original number of colors, no interpolated colors will be calculated. For most flexibility you can set N to 256.

Afterwards, you can multiply the values again by 255 to get rgb values in the range 0-255.

As long as it's just insert field XY and no computation in there, it's fairly simple to build:

I'm going by what I remember from the last time I investigated this. Grain of salt and all that.

the fixed point format splits the integer and fractional parts of your (x,y)-coordinates into different maps.

it's "compact" in that CV_32FC2 or 2x CV_32FC1 uses 8 bytes per pixel, while CV_16SC2 + CV_16UC1 uses 6 bytes per pixel. also it's integer-only, so using it can free up floating point compute resources for other work.

the integer parts go into the first map, which is 2-channel. no surprises there.

the fractional parts are converted to 5-bit integers, i.e. they're multiplied by 32. then they're packed together, lowest 5 bits from one coordinate, higher next 5 bits from the other one.

the resulting funny number has a range of 0 .. 1023, or 0b00000_00000 .. 0b11111_11111, which encodes fractional parts (0.0, 0.0) and (0.96875, 0.96875) respectively (that's 31/32).

during remap...

the integer map is used to look up, for every resulting pixel, several pixels in the source image required for interpolation.

the fractional map is taken as an index into an "interpolation table", which is internal to OpenCV. it contains whatever factors and shifts required to correctly blend the several sampled pixels into one resulting pixel, all using integer math. I guess there are multiple tables, one for each interpolation method (linear, cubic, ...).

Replace the line you commented out with this

For a number value_between_start_1_and_end_1,

There are two ways to interpret your question. In your example, the vector x should be y since only provided one vector:

I don't think there is any mechanism to retrieve the height of terrain within an expression, so no.

In any case, according to the documentation the terrain type only has basic functionality (ie, not data-driven expressions), so you can't do what you're trying to do for that reason, too.

If I understand your question the right way, you could use dplyr and tidyr:

You can do this