Publications by Harold Nelson
Exercises on Tuples
Exercises on Tuples Harold Nelson 2/4/2022 Tuples A tuple is a sequence of values separated by commas. A tuple may or may not be enclosed in parentheses. Here are some examples. t1 = 1,2,3 t2 = (1,2,3) print(t1) ## (1, 2, 3) print(t2) ## (1, 2, 3) Note that in both cases print() enclosed the tuples in parentheses. Problem 1: Stop the Video an...
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Class Demo
R Markdown This is an R Markdown document. Markdown is a simple formatting syntax for authoring HTML, PDF, and MS Word documents. For more details on using R Markdown see http://rmarkdown.rstudio.com. When you click the Knit button a document will be generated that includes both content as well as the output of any embedded R code chunks within t...
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Get and Clean 2
San Diego Let’s get the weather from San Diego to compare with Olympia. Libraries library(tidyverse) ## ── Attaching packages ───────────────────────────────────────────────────────────────────────�...
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Function Exercises
Exercises on Functions Nelson 2/5/2020 Ex1 Create a function, quad(a,b,c,x), to evaluate a quadratic polynomial at a given value of x. The parameters of the function are, in order: a, the coefficient of the quadratic term. b, the coefficient of the linear term. c, the constant term. x, the value at which the polynomial is to be evaluated. Th...
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Get and Clean
Libraries library(tidyverse) ## ── Attaching packages ───────────────────────── tidyverse 1.3.0 ── ## ✓ ggplot2 3.2.1 ✓ purrr 0.3.3 ## ✓ tibble 2.1.3 ✓ dplyr 0.8.3 ## ✓ tidyr 1.0.2 ✓ stringr 1.4.0 ## ✓ readr 1.3.1 ✓ forcats 0.4.0 ## ── Conflicts...
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List Exercise 3
List Exercises 3 Harold Nelson 2/4/2020 Ex1 Append and Concatenate What is the difference between appending to a list and concatenation? Answer l1 = [1,2,3] l2 = [4,5,6] l3c = l1 + l2 print(l3c) ## [1, 2, 3, 4, 5, 6] l1.append(l2) print(l1) ## [1, 2, 3, [4, 5, 6]] The second list became a member of the first list. Ex2 Why didn’t I store t...
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GHCN Resources
Load Libraries library(tidyverse) ## ── Attaching packages ──────────────────────────────────── tidyverse 1.2.1 ── ## ✔ ggplot2 3.2.1 ✔ purrr 0.3.3 ## ✔ tibble 2.1.3 ✔ dplyr 0.8.3 ## ✔ tidyr 1.0.0 ✔ stringr 1.4.0 ## ✔ readr 1.3.1 ...
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Notes jan 22
load("/cloud/project/cdc.Rdata") str(cdc) ## 'data.frame': 20000 obs. of 9 variables: ## $ genhlth : Factor w/ 5 levels "excellent","very good",..: 3 3 3 3 2 2 2 2 3 3 ... ## $ exerany : num 0 0 1 1 0 1 1 0 0 1 ... ## $ hlthplan: num 1 1 1 1 1 1 1 1 1 1 ... ## $ smoke100: num 0 1 1 0 0 0 0 0 1 0 ... ## $ height : num 70 64 60 66 61 ...
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Notes on Conditional Execution
Conditional Execution Harold Nelson 1/23/2020 Instructions In the exercises that follow, try to predict what the python interpreter would do. Commit yourself on paper to your prediction. Then copy the code to a Jupyter notebook and run it. Each block begins with one or more logical variables of the form condn, where the n is replaced by an int...
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Notes CSC 530 Nov 25
Hyperparameter Tuning I’ll take an example from Kuhn’s documentation on github. This uses a support vector machine with a radial kernel to distinguish between mines and rocks using sonar data. The particulars of the example are unimportant. What I’m interested in is the significance of the way that hyperparameter tuning is specified. In thi...
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