How do I fix the particular error code that I was given for my code?

I am working on an assignment where I have a main script and several functions. In one particular function I am working on, I need to call from a structure array I made in a previous function that is also located in the main script. I also need to call a single output from a two output function I made. I am receiving an error and I do not know what it means or how to fix it. Please let me know if there is additional information needed (like the mainscript or other functions). Even without the error, I feel my code may be incorrect. I can't even check, however. Help would be greatly appreciated, as I have been struggling with this for a while. Thank you in advance!

Here is the error:

Unrecognized function or variable 'HurricaneData'.

Error in generateReport (line 14)

name = HurricaneData(range).name;

Here is the function Code:

function generateReport(allHurricaneData)
% uses the hurricane data to create a report 
%   INPUT: allHurricaneData - structure array that has the data for all the
%          hurricanes with six fields: name, data, Xs, Ys, wind, pressure
%   OUTPUT: a report stored in a CSV file called hurricaneReport.csv where
%           each row has the following information: name of hurricane,
%           first date, last date, max wind, max pressure, max category
%           e.g. for Cindy: Cindy, Jun 19, Jun 24, 60, 1004, 0
hurricaneReportfid = fopen('hurricaneReport.csv', 'w');
% loop through 13 names
for range = 1:13
    name = allHurricaneData(range).name;
    firstDate = string(allHurricaneData(range).date{1,1});
    lastDate = string(allHurricaneData(range).date{30,1});
    maxWind = max(allHurricaneData(range).wind);
    maxPressure = max(allHurricaneData(range).pressure);
    category = (category == calcCategory(maxWind));
    fprintf(hurricaneReportfid,'%s, %s, %s, %d, %d, %d,\n', name, firstDate, lastDate,maxWind, maxPressure, category);
end
fclose('all');
end

Answer 1

[VBBV]

generateReport(allHurricaneData) % are you calling structure in this way in main script 

or

generateReport(HurricaneData)  %  this does not exist

[Me]

I am calling the function generateReport(allHurricaneData) in the main script. THe structure is in the function getAllHurricaneData. The generateReport function is using the output allHurricaneData from the getAllHurricaneData function to get specific values to print to a new CSV file.

[VBBV]

What are input arguments to function getAllHurricaneData ? can you attach fhe relevant function files ?

[Me]

getAllHurricaneData :

function allHurricaneData = getAllHurricaneData(allHurricanesFileName)
% takes the NAME of an input CSV file that has a single column with the names 
% of the individual hurricanes CSV files and extracts hurricane data from
% the files into a structure Aarray
%   INPUT: allHurricanesFileName - char array, which is the name of input
%          CSV file 
%   RETURNS: allHurricaneData - structure array that has the data for all
%            the hurricanes with six fields: name, date, Xs, Ys, wind, pressure
a = readcell(allHurricanesFileName);
for x = 1:size(a)
    c = a{x,1};
    d = readmatrix(c);
    e = readtable(c);
    HurricaneData(x).name = c(1:end-4);
    HurricaneData(x).date = e(1:end,:);
    HurricaneData(x).Xs = d(:,5);
    HurricaneData(x).Ys  = d(1:end,6);
    HurricaneData(x).wind = d(1:end,7);
    HurricaneData(x).pressure = d(1:end,8);
end
allHurricaneData = HurricaneData;
end

calcCategory:

function [category, color] = calcCategory(wind)
% wind strength determines hurricane category and color
%   INPUT: wind - a number for the wind speed (mph) of particular hurricane
%                 data point
%   OUTPUTs: category - an integer between 0-5 for hurricane category based
%                       on wind speed
%            color - triple value RGB color
%  
%            category 0: <=38, color [0 1 1], turquoise
%            category 0: 39-73, color [0.25 1 0], green
%            category 1: 74-95, color [1 1 0], yellow
%            category 2: 96-110, color [0 0.75 0], orange
%            category 3: 111-129, color [1 0 0], red
%            category 4: 120-156, color [0.75 0 1], violet
%            category 5: >=157, color [1 0 1], pink
if wind <= 38
    category = 0;
    color = [0 1 1];
end
if wind >= 39 && wind <= 73
    category = 0;
    color = [0.25 1 0];
end
if wind >= 74 && wind <= 95
    category = 1;
    color = [1 1 0];
end
if wind >= 96 && wind <= 110
    category = 2;
    color = [0 0.75 0];
end
if wind >= 111 && wind <= 129
    category = 3;
    color = [1 0 0];
end
if wind >= 130 && wind <= 156
    category = 4;
    color = [0.75 0 1];
end
if wind >=157
    category = 5;
    color = [1 0 1];
end
end

[VBBV]

Z(Y)  % e.g.  Z = generateReport , Y = HurricaneData

Unrecognized function or variable 'Y'.

Y = X  % getAllHurricaneData

function Z(Y)
 Y.name
end
function Y =  X
 B.name = 'H';
 B.value = 120;
 Y = B
end

can you check which order you are calling functions generateReport and getAllHurricaneData in the main script ? May be you are not calling in correct sequence

[Me]

This is the order in which I am calling them:

allHurricaneData = getAllHurricaneData('allHurricanes.csv');

generateReport(allHurricaneData)

[Walter Roberson]

Error in generateReport (line 14)

name = HurricaneData(range).name;

The line in the error message does not exist in the code you posted. Line 14 of generateReport is

lastDate = string(allHurricaneData(range).date{30,1});

and the closest similar line is line 12 of the file which contains

name = allHurricaneData(range).name;

You need to figure out how it managed to run a line of code that does not exist in the file you think you are executing. You should use

which -all generateReport

to see if you are accidentally invoking a different generateReport.m than you think you are. And you should probably

clear generateReport

just in case there was an old version of it stored in memory.

[VBBV]

Since you are assigning HurricaneData structure to allHurricaneData variable as the output in the below function, whenver this function is called or run

getAllHurricaneData(allHurricanesFileName)

it creates the structure HurricaneData but does not save or store the data into workspace each time. So, each time you call generateReport function to access allHurricaneData,

function generateReport(allHurricaneData)

it refers or points to the data present in variable HurricaneData which does not exist in workspace anymore since variables defined inside function calls are not stored in workspace. So you need to use the same name as shown below as the ouput for the function getAllHurricaneData

    function generateReport(HurricaneData)  % use same name

in order to access whole data and avoid that error.

function generateReport(HurricaneData)  % use same name
% uses the hurricane data to create a report 
%   INPUT: allHurricaneData - structure array that has the data for all the
%          hurricanes with six fields: name, data, Xs, Ys, wind, pressure
%   OUTPUT: a report stored in a CSV file called hurricaneReport.csv where
%           each row has the following information: name of hurricane,
%           first date, last date, max wind, max pressure, max category
%           e.g. for Cindy: Cindy, Jun 19, Jun 24, 60, 1004, 0
hurricaneReportfid = fopen('hurricaneReport.csv', 'w');
% loop through 13 names
for range = 1:13
    name = HurricaneData(range).name;  % use same  name
    firstDate = string(HurricaneData(range).date{1,1});  % use same name
    lastDate = string(HurricaneData(range).date{30,1});
    maxWind = max(HurricaneData(range).wind);
    maxPressure = max(HurricaneData(range).pressure);
    category = (category == calcCategory(maxWind));
    fprintf(hurricaneReportfid,'%s, %s, %s, %d, %d, %d,\n', name, firstDate, lastDate,maxWind, maxPressure, category);
end
fclose('all');
end
        
function HurricaneData = getAllHurricaneData(allHurricanesFileName)
% takes the NAME of an input CSV file that has a single column with the names 
% of the individual hurricanes CSV files and extracts hurricane data from
% the files into a structure Aarray
%   INPUT: allHurricanesFileName - char array, which is the name of input
%          CSV file 
%   RETURNS: allHurricaneData - structure array that has the data for all
%            the hurricanes with six fields: name, date, Xs, Ys, wind, pressure
a = readcell(allHurricanesFileName);
for x = 1:size(a)
    c = a{x,1};
    d = readmatrix(c);
    e = readtable(c);
    HurricaneData(x).name = c(1:end-4);
    HurricaneData(x).date = e(1:end,:);
    HurricaneData(x).Xs = d(:,5);
    HurricaneData(x).Ys  = d(1:end,6);
    HurricaneData(x).wind = d(1:end,7);
    HurricaneData(x).pressure = d(1:end,8);
end
% HurricaneData = HurricaneData;  
end

Answer 2

[Kalil]

Use

[category, ~] = max(calcCategory(max(allHurricaneData(range).wind)))

This will grab the max category for each hurricane.

Also use

firstDate = string(allHurricaneData(range).date{2,1}); 
lastDate = string(allHurricaneData(range).date{end,1});

To get the first and last dates.

[Walter Roberson]

@Kalil

Is there a particular reason why you ask for two outputs from max() but ignore the second output ?

[Kalil]

Just remove the outside max(). And I don't want generateReport calling "color" for efficiency.

[Walter Roberson]

I am referring to the fact you used

[category, ~] = max(STUFF)

instead of

category = max(STUFF)

I am trying to understand why you have the ignored second output there?

[Kalil]

Doesn't matter much. Either work fine. It's just so that I remember that there's another output not being used.