Create a correlation matrix using the dataset. Plot the correlation matrix using seaborn's heatmap(). Mask the upper triangle. The chart should look like "examples/Figure_2.png"

Python
1

Hi, I am in the last portion of Medical Data Visualizer project. I have created my correlation matrix, and also my heat map. However, it does not quite look as the example provided on the test - figure 2, I am wondering what other arguments I can add to edit my map.

Here is my Code,
mask = np.zeros_like(df_heat_map)
mask[np.triu_indices_from(mask)] = True
with sns.axes_style(‘white’):
f, ax = plt.subplots(figsize=(16, 12))
ax = sns.heatmap(df_heat_map, mask=mask, square=True, annot = True, annot_kws={“size”: 8}, vmax= .24)

I am attaching an image of my heatmap as well.

I appreciate your help.

heatmap
heatmap849×722 26.2 KB

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Challenge: Medical Data Visualizer

Link to the challenge:

2

It doesn’t have to look exactly the same, but here is something close (note the fmt='0.1f' option – don’t round the values before that):

fig, ax = plt.subplots( figsize=(10,8) )
sns.heatmap(df_heat_map.corr(), mask=mask,
            annot=True, center=0,
            linewidths=.5, square=True,
            vmin=-0.15, vmax=0.3, fmt='0.1f')

image
image659×558 77.8 KB

3

Thank you so much for your help.

4

Hello, I will appreciate any help regarding a problem related to this heatmap, according to my code the .png is showing the exact correct values as shown below:

heatmap (2)
heatmap (2)1200×1200 57.9 KB

According to the test what my list of values is missing is 3 empty values at the end of the list:

…[‘0.0’, ‘0.0’, ‘-0.0’, ‘0.0’, ‘-0.1’, ‘0.5’, ‘0.0’, ‘0.1’, ‘0.1’, ‘0.3’, ‘0.0’, ‘0.0’, ‘0.0’, ‘0.0’, ‘0.0’, ‘0.0’, ‘0.2’, ‘0.1’, ‘0.0’, ‘0.2’, ‘0.1’, ‘0.0’, ‘0.1’, ‘-0.0’, ‘-0.1’, ‘0.1’, ‘0.0’, ‘0.2’, ‘0.0’, ‘0.1’, ‘-0.0’, ‘-0.0’, ‘0.1’, ‘0.0’, ‘0.1’, ‘0.4’, ‘-0.0’, ‘-0.0’, ‘0.3’, ‘0.2’, ‘0.1’, ‘-0.0’, ‘0.0’, ‘0.0’, ‘-0.0’, ‘-0.0’, ‘-0.0’, ‘0.2’, ‘0.1’, ‘0.1’, ‘0.0’, ‘0.0’, ‘0.0’, ‘0.0’, ‘0.3’, ‘0.0’, ‘-0.0’, ‘0.0’, ‘-0.0’, ‘-0.0’, ‘-0.0’, ‘0.0’, ‘0.0’, ‘-0.0’, ‘0.0’, ‘0.0’, ‘0.0’, ‘0.2’, ‘0.0’, ‘-0.0’, ‘0.2’, ‘0.1’, ‘0.3’, ‘0.2’, ‘0.1’, ‘-0.0’, ‘-0.0’, ‘-0.0’, ‘-0.0’, ‘0.1’, ‘-0.1’, ‘-0.1’, ‘0.7’, ‘0.0’, ‘0.2’, ‘0.1’, ‘0.1’, ‘-0.0’, ‘0.0’, ‘-0.0’, ‘0.1’]
F

FAIL: test_heat_map_values (test_module.HeatMapTestCase)

Traceback (most recent call last):
File “/home/runner/fcc-medical-data-visualizer/test_module.py”, line 47, in test_heat_map_values
self.assertEqual(actual, expected, “Expected differnt values in heat map.”)
AssertionError: Lists differ: ['0.0[607 chars] ‘0.2’, ‘0.1’, ‘0.1’, ‘-0.0’, ‘0.0’, ‘-0.0’, ‘0.1’] != ['0.0[607 chars] ‘0.2’, ‘0.1’, ‘0.1’, ‘-0.0’, ‘0.0’, ‘-0.0’, ‘0.1’, ‘’, ‘’, ‘’]

Second list contains 3 additional elements.
First extra element 91:
‘’

Diff is 989 characters long. Set self.maxDiff to None to see it. : Expected differnt values in heat map.

Ran 4 tests in 8.309s

FAILED (failures=1)

As a sidenote, I had to replace my poetry.lock file and added the latest packages with their dependecies to my Repl.it, so the versions are as following:
matplotlib: 3.3.1
numpy: 1.19.1
pandas: 1.1.1
seaborn: 0.10.1
My Repl.it: fcc-medical-data-visualizer - Replit
Thank you in advance for your time and help!

5

Change matplotlib version to 3.1.3

1 Like
6

Thanks for your answer, I can’t seem to find a way to select Older Versions of the packages from Repl.it, a fresh fork from the Curriculum Project Link outputs the following error, hence why I’m adding packages manually:

Repl.it: Updating package configuration

→ python3 -m poetry lock

[RuntimeError]
The Poetry configuration is invalid:

  • ‘description’ is a required property

exit status 1

Repl.it: Package operation failed.

What I’m doing is selecting the Packages from the left side Toolbar , but only the latest version is shown by the search package tool

screenreplit
screenreplit1365×659 101 KB

7

You can use the fresh fork (comes with the right package versions), but you need to go to the pyproject.toml file and add a description line manually

description = ""

image
Otherwise, you can change the matplotlib version in the poetry.lock file.

2 Likes
8

Thanks! Now it is working! I added the desciption = “” you highlighted and also a new line with matplotlib = “3.2.2” after seaborn = “*” , since that was the version that the original file in the Curriculum Project was updating to 3.3.1, important to do NOT use a carat before the number version of matplotlib, since this will use the latest package anyway

1 Like