savefig/questions.rst
author amit
Wed, 13 Oct 2010 17:32:59 +0530
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child 353 e13e3452c599
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Objective Questions
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-------------------
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.. A mininum of 8 questions here (along with answers)
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1. What argument can be used with savefig to increase the resolution
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   of the plot while saving a plot.
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   a. fname
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   #. transparency
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   #. dpi
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   #. format
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Answer: dpi
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2. The fname argument of savefig has to be always absolute path.
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   a. True
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   #. False
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Answer: False
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3. You are right now in the directory `/home/fossee`, from the
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   following which one is the correct one in-order to save the plot as
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   svg with the filename `plot` to the directory `/home/fossee/sine/`
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   a. savefig('/sine/plot.svg')
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   #. savefig('sine/plot.svg')
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   #. savefig('home/fossee/sine/plot.svg')
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   #. All of these
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   #. None of the above
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Answer: savefig('sine/plot.svg')
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4. Which is the best image format to be used with Latex documents
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   which savefig supports?
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   a. SVG - Scalable Vector Graphics
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   #. EPS - Encapsulated Post Script
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   #. PS - Post Script
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   #. PNG - Portable Network Graphics
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   #. None of the above
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Answer: EPS - Encapsulated Post Script
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5. ``savefig('sine.png')`` saves the plot in,
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   a. The root directory ``/`` (on GNU/Linux, Unix based systems)
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      ``c:\`` (on windows).
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   #. Will result in an error as full path is not supplied.
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   #. The current working directory.
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   #. Predefined directory like ``/documents``.
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Answer: The current working directory.
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6. Study the following code and tell what will happen,
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   ::
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      savefig('cosine.png',facecolor='blue')
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   a. Will generate an error as plot statements are missing
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   #. Will generate an error as full path is not specified
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   #. Create a file ``cosine.png`` with blue background at the current
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      working directory.
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   #. Create a file ``cosine.png`` with blue background at a
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      predefined directory like ``/documents``.
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Answer: Create a file ``cosine.png`` with blue background at the
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	current working directory.
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7. How to save the below plot as ``sine_green_border.png`` with green
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   color border/edge in the current working directory.  The plot is given
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   as,
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   ::
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	x = linspace(-5*pi,5*pi,200)
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	plot(x,sin(x),linewidth=2)
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	legend(['sin(x)'])
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   a. ``savefig('sine_green_border.png',bordercolor='green')``
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   #. ``savefig('sine_green_border.png',facecolor='green')``
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   #. ``savefig('sine_green_border.png',edgecolor='green')``
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   #. ``savefig('/sine_green_border.png',bordercolor='green')``
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Answer: savefig('sine_green_border.png',edgecolor='green')
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8. Given the below code snippet, what does it do?
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   ::
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	x = linspace(-5*pi,5*pi,200)
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	plot(x,sin(x),linewidth=2)
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	legend(['sin(x)'])
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    	savefig('sine.png',format='pdf',papertype='a4')
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   a. Save the sine plot in file sine.png as a pdf file in page-size
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      A4 and saves it into the current working directory
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   #. Save the sine plot in file sine.png.pdf in page-size A4 into the
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      current working directory.
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   #. Save the sine plot in a file sine.png in png format with
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      page-size A4 in the current working directory overriding the
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      format argument
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   #. Error in filename and format mismatch.
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Answer: Save the sine plot in file sine.png as a pdf file in page-size
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	A4 and saves it into the current working directory
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Larger Questions
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----------------
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.. A minimum of 2 questions here (along with answers)
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1. Plot a cosine plot from -2pi to 2pi in green color taking 300
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   points. Title the plot as 'Cosine plot' and the legend plot with
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   'cos(x)'. And save the plot as a pdf file with the filename
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   cosine_plot.
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2. Plot tan(x) where x varies from -4pi to 4pi in red color taking 600
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   points. Title the plot as 'Tan plot' and the legend plot with
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   'tan(x)'. And save the plot as a svg file with the filename
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   tangent_plot.