CDSLab Recipes - A repository for all sorts of problems with solutions

Problem Move just one matchstick in the following equation to make it hold.

Problem How many and what living creatures can you identify in this picture?

Problem Consider this dataset, 1880_2020.csv, which contains the global land and ocean temperature anomalies of the earth from January 1880 to June 2020 at every month. As stated in the file, temperatures are in Degrees Celsius and reported as anomalies...

Problem Supposed we have observed a dataset comprised of events with one attribute as in this file: z.csv. Plotting these points would yield a histogram like the following plot, Now our goal is to form a hypothesis about this dataset,...

Problem Supposed we have observed a dataset comprised of $15027$ events with one attribute variable in this file: dataFull.csv. Plotting these points would yield a histogram like the following plot, Now our goal is to form a hypothesis about this...

Problem Generate two arrays corresponding to the values of $\sin(x)$ and $\cos(x+\pi/2)$ functions in the range $[0, 10\pi]$. Make a plot of the resulting arrays like the following illustration. Now use an FFT package in the language of your choice...

Problem Consider this dataset of carbon emissions history per country. Make a visualization of the global carbon emission data in the CSV file in the above by summing over the contributions of all countries per year to obtain an illustration...

Problem Recall the globalLandTempHist.txt dataset that consisted of the global land temperature of Earth over the past 300 years. Also recall that the autocorrelation of a time-series is defined as the correlation of a univariate dataset with itself, with some...

Problem Consider the following Banana function. def getLogFuncBanana(point): import numpy as np from scipy.stats import multivariate_normal as mvn from scipy.special import logsumexp NPAR = 2 # sum(Banana,gaussian) normalization factor normfac = 0.3 # sum(Banana,gaussian) normalization factor lognormfac = np.log(normfac) #...

Problem What is ugly in the following graph?

Problem Which color scale has been used in the following visualization?

Problem Consider the following plot displaying the temperatures of a number of US cities. The coordinates used in this type of visualization of data is called polar coordinates. Polar coordinates are useful for displaying the kind data that is periodic...

Problem What is wrong in the following visualization?

Problem Consider the following salary data. Data Scientist | Physicist | Bioinformatician ---------------|-----------|----------------- $110,000 | $122,000 | $58,000 Make a graph of this data in Microsoft Excel similar to the following visualization.

Problem Which classes of color scales the following color-mappings belong to? Very briefly describe the primary use case of each class. a) b) c) d)

Problem Supposed we have observed a dataset comprised of events with two attributes $x$ and $y$ as in this file: data.xlsx. Plot this data in Microsoft Excel. Form a hypothesis about the relationship between $x$ and $y$. Use Excel’s Trendline...

Problem Suppose I have discovered a positive relationship between properties of some celestial objects, like the one formed by the black dots in the following figure. But in making such a discovery, I repeatedly and subconsciously throw away any data...

Problem Consider the following csv dataset containing the temperature of cities around the world from 1995 to 2020. Each row in the file corresponds to the average temperature (in Fahrenheit) of a city in a given day of the year....

Problem Consider the following Excel dataset containing the temperature of two US cities Honolulu, HI and Duluth, MN from 1995 to 2020. There are two pages in the Excel file: Duluth, and Honolulu. Each row in the file corresponds to...

Problem Consider the following dataset containing the average annual precipitation in the US states between 1971-2000 and this dataset. Combine these two datasets in Excel and generate a plot of US states precipitation vs. sunshine like the following figure. Note...