Puzzler: Data exploration solution
This was a fun little puzzle. I wonder how many people got to the first image, but did not continue to the real solution!
Contents
Load the data and take a first look
load puzzler.mat plot(c,'.')
What is this stuff?
There is a lot of data, ranges from ~0 to ~255. Makes me think it is an image that has been made into a vector. How many different ways can this data be reshaped into a matrix?
dimensions = factor(numel(c))
dimensions = 419 557
Reshape it!
What 'luck'! There is only one pair of prime factors. Makes you think this is the right path.
d = reshape(c, dimensions); imagesc(d) colormap(gray)
Tricky one.
We are on the right path, but not there yet. Those values were suspicious. Why were there decimal parts for an image. Let's look at the decimal parts.
e = rem(d,1); imagesc(e)
There is pattern here
This is the right path, there is pattern here
f = e(:);
plot(f,'.'); Lets try the other reshape
There are two possible reshapes, try the other
g = reshape(f, fliplr(dimensions)); imagesc(g)
This is it
Now just clean it up a little
h = rot90(g, -1); imagesc(h)
- 类别:
- Puzzler
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