Added documentation for slicing data cubes #52
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| By setting ``slices=(50, 'x', 'y')``, we have chosen to plot the second dimension on the y-axis and the third dimension on the x-axis. Even though we are not plotting the all the dimensions, we have to specify which slices to select for the dimensions that are not shown. In this example, we are not plotting the first dimension so we have selected the slice 50 to display. You can experiment with this by changing the selected slice and looking at how the plotted image changes. |
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Could you wrap the text at 79 characters? (most code editors can do this).
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Ah I actually removed that warning from my text editor because it started to bother me. I'll change this.
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@astrofrog - I've made all the changes I could think of right now to the docs. Do you have any suggestions for adding things? |
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| By setting ``slices=(50, 'x', 'y')``, we have chosen to plot the second | ||
| dimension on the y-axis and the third dimension on the x-axis. Even though we |
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I think here it should be 'the second dimension on the x-axis, and the third dimension on the y-axis'?
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The second dimension is the declination and the third dimension is the velocity, so haven't they been plotted on the y and x axis respectively?
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Oh right, I accidentally wrote slices=(50, 'x', 'y') instead of slices=(50, 'y', 'x')
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Once my two small comments have been addressed, this is ready to merge - thanks @anizami! |
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@astrofrog - fixed the typo and wrapped the text at 79 characters :) |
| This is a three-dimensional dataset which you can check by looking at the | ||
| header information by:: | ||
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| hdu.header |
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@anizami - sorry, just one more comment - here, maybe you can put:
>>> hdu.header
NAXIS = 3
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basically just show the first few lines of the output of the header, enough to see it's 3-d and the dimensions.
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| The header keyword 'NAXIS' gives the number of dimensions of the dataset. The keywords 'CTYPE1', 'CTYPE2' and 'CTYPE3' give the data type of these dimensions to be right ascension, declination and velocity respectively. | ||
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@astrofrog - is this okay?
Added documentation for slicing data cubes
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thanks! :) |
Added documentation for slicing data cubes
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