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1 .. Author : Nishanth |
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2 Internal Reviewer 1 : Anoop |
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3 Internal Reviewer 2 : Madhu |
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4 External Reviewer : |
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5 |
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6 .. Prerequisites: using ``plot`` command |
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7 |
1 Hello friends and welcome to the tutorial on Embellishing Plots. |
8 Hello friends and welcome to the tutorial on Embellishing Plots. |
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3 {{{ Show the slide containing title }}} |
10 {{{ Show the slide containing title }}} |
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5 {{{ Show the slide containing the outline }}} |
12 {{{ Show the slide containing the outline }}} |
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7 In this tutorial, we shall look at how to modify the colour, thickness and |
14 In this tutorial, we shall look at how to modify the colour, thickness and |
8 linestyle of the plot. We shall then learn how to add title to the plot and |
15 linestyle of the plot. We shall then learn how to add title to the plot and |
9 then look at adding labels to x and y axes. we shall also look at adding |
16 then look at adding labels to x and y axes. we shall also look at adding |
10 annotations to the plot. |
17 annotations to the plot and setting the limits of axes. |
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18 |
12 Let us start ipython with pylab loaded, by typing on the terminal |
19 Let us start ipython with pylab loaded, by typing on the terminal |
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20 |
14 {{{ shift to terminal and type ipython -pylab }}} |
21 {{{ shift to terminal and type ipython -pylab }}} |
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282 |
289 |
283 {{{ continue from paused state }}} |
290 {{{ continue from paused state }}} |
284 |
291 |
285 As we can see, every annotate command makes a new annotation on the figure. |
292 As we can see, every annotate command makes a new annotation on the figure. |
286 |
293 |
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294 Now we have everything we need to decorate a plot. but the plot would be |
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295 incomplete if we can not set the limits of axes. This is possible using the |
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296 button on the plot window. |
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297 |
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298 we shall look at how to get and set them from the script. |
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299 :: |
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300 |
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301 xlim() |
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302 ylim() |
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303 |
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304 We see that ``xlim`` function returns the current x axis limits and ylim |
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305 function returns the current y-axis limits. |
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306 |
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307 Let us look at how to set the limits. |
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308 :: |
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309 |
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310 xlim(-4, 5) |
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311 |
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312 We see the limits of x-axis are now set to -4 and 5. |
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313 Similarly |
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314 :: |
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315 |
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316 ylim(-15, 2) |
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317 |
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318 sets the limits of y-axis appropriately. |
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319 |
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320 {{{ Pause here and try out the following exercises }}} |
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321 |
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322 %% 7 %% Set the limits of axes such that the area of interest is the rectangle |
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323 (-1, -15) and (3, 0) |
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324 |
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325 {{{ continue from paused state }}} |
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326 |
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327 As we can see, the lower upper limits of x-axis in the question are -1 and 3. |
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328 The limits of y-axis are -15 and 0. |
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329 |
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330 :: |
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331 |
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332 xlim(-1, 3) |
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333 ylim(-15, 0) |
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334 |
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335 Gives us the required rectangle. |
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336 |
287 {{{ Show summary slide }}} |
337 {{{ Show summary slide }}} |
288 |
338 |
289 we have looked at |
339 we have looked at |
290 |
340 |
291 * Modifying the attributes of plot by passing additional arguments |
341 * Modifying the attributes of plot by passing additional arguments |
292 * How to add title |
342 * How to add title |
293 * How to incorporate LaTex style formatting |
343 * How to incorporate LaTex style formatting |
294 * How to label x and y axes |
344 * How to label x and y axes |
295 * How to add annotations |
345 * How to add annotations |
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346 * How to set the limits of axes |
296 |
347 |
297 {{{ Show the "sponsored by FOSSEE" slide }}} |
348 {{{ Show the "sponsored by FOSSEE" slide }}} |
298 |
349 |
299 .. #[Nishanth]: Will add this line after all of us fix on one. |
350 .. #[Nishanth]: Will add this line after all of us fix on one. |
300 |
351 |
301 This tutorial was created as a part of FOSSEE project, NME ICT, MHRD India |
352 This tutorial was created as a part of FOSSEE project, NME ICT, MHRD India |
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353 |
303 Hope you have enjoyed and found it useful. |
354 Hope you have enjoyed and found it useful. |
304 Thankyou |
355 Thankyou |
305 |
356 |
306 .. Author : Nishanth |
357 Questions |
307 Internal Reviewer 1 : Anoop |
358 ========= |
308 Internal Reviewer 2 : Madhu |
359 |
309 External Reviewer : |
360 1. Draw a plot of cosine graph between -2pi to 2pi with line thickness 4 |
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361 |
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362 Answer:: |
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363 |
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364 x = linspace(-2*pi, 2*pi) |
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365 plot(x, cos(x), linewidth=4) |
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366 |
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367 2. Draw a plot of the polynomial x^2-5x+6 in the range 0 to 5 in blue dotted |
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368 line |
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369 |
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370 Answer:: |
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371 |
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372 x = linspace(-2*pi, 2*pi) |
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373 plot(x, x**2 - 5*x + 6, 'r.') |
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374 |
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375 3. Which marker is used to get circles |
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376 |
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377 a. '.' |
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378 #. '^' |
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379 #. 'o' |
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380 #. '--' |
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381 |
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382 4. What does the '^' marker produce |
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383 |
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384 Answer: Triangle up marker |
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385 |
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386 5. How do you set the title as x^2-5x+6 in LaTex style formatting |
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387 |
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388 Answer: title("$x^2-5x+6$") |
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389 |
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390 6. What happens when the following code is executed:: |
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391 |
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392 xlabel("First label") |
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393 xlabel("Second label") |
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394 |
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395 Answer: The label of x-axis is set to "Second label" |
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396 |
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397 7. Read thorugh the documentation and find out is there a way to modify the |
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398 alignment of text in the command ``ylabel`` |
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399 |
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400 a. Yes |
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401 #. No |
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402 |
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403 Answer: No |
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404 |
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405 8. How to add the annotation "Maxima" at the point (1, 2) |
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406 |
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407 Answer: annotate("Maxima", xy=(1, 2)) |
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408 |
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409 9. Is the command ``annotate("max", (1, 2))`` same as ``annotate("max", |
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410 xy=(1, 2)`` |
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411 |
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412 a. True |
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413 b. False |
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414 |
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415 Answer: True |
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416 |
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417 10. When a new annotation is made at a point, what happens to the old one |
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418 |
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419 a. It is replaced |
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420 b. It is overwritten |
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421 c. The new annotation is combined with old one |
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422 |
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423 Answer: It is overwritten |
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424 |
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425 11. What happens when xlim is used without arguments |
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426 |
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427 Answer: It gives the current limits of x-axis |
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428 |
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429 12. What happens when ``ylim(0, 5)`` is used |
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430 |
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431 Answer: It sets the lower and upper limits of y-axis to 0 and 5 |
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432 |
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433 13. Draw a cosine plot from 0 to 2*pi with green dots. annotate the origin as |
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434 "origin" and set x and y labels to "x" and cos(x) and x limits to 0 and |
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435 2pi and y limits to -1.2 and 1.2 |
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436 |
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437 Answer:: |
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438 |
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439 x = linspace(0, 2*pi) |
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440 plot(x, cos(x), 'g.') |
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441 annotate("origin", (0, 0)) |
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442 xlabel("$x$") |
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443 ylabel("$cos(x)$") |
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444 xlim(0, 2*pi) |
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445 ylim(-1.2, 1.2) |
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446 |