Question

matlab

Answer 1

%% Problem 9.17
%{
In the previous chatper, the data in this problem were evaluated using the
find function. Repeat the calcuations, using a nested loop structure. The
file lake_powell.dat contains the data listed in Table 8.9.
%}

% converts excel to mat format and assigned new name
lake_powell = xlsread('lake_powell.xlsx');

% saves data at mat file
save('data', 'lake_powell');

Answer 2

@jim_thompson5910

Answer 3

that's all you have so far?

Answer 4

yeah, let me work on it a bit.

Answer 5

I am going to have to do some reading and understand the problem because the question asks to use a table from a previous chapter but I am not sure if I am suppose to answer the question in the previous problem or answer another set of questions.

Answer 6

it won't find the third column, says Index exceeds matrix dimensions.

Answer 7

How in the world is it exceeding dimension? it's a 15x3 matrix.

Answer 8

`it won't find the third column, says Index exceeds matrix dimensions.`
how are you trying to find the third column?

Answer 9

data(:,1)
data(:,2)

nvm I can use this, instead of using find. Using find is irrelevent

Answer 10

How do i extract the years from the matrix?

Answer 11

It seems like the first row doesn't exist. The "first" column being years?

Answer 12

(a) Plot both the September values and March values vs. the year, and add a
line represnting the average ice extent for 1979-2000.