How can I print the result of a function using fprintf? (matrix and string!)

The variable countries is a 27x1 column vector with 3 letter abbreviations (ex. 'CAN'). Results is a 27x4 matrix with values ranging from 0-40 ish. Why can't I print them together or row by row?

I want the result to look like this:

Country Gold Silver Bronze

CAN 2 1 3

ITA 3 1 4

... etc.

My code:

Please skip to the bottom of this code for the part I'm having issues with.

function [] = Untitled6()
load('olympics.mat')
results = zeros(size(countries,1),4);
results = compute_medals(gold,silver,bronze,countries);
print_country_results(countries,results);
end

function results = compute_medals(gold,silver,bronze,countries);
% computes number of gold, silver, bronze medals and
% total medal tally for a given country and a given sport type
% results = zeros(size(countries,1),4);

for i = 1:length(countries)
    country = countries(i, :);
    goldCount = 0;
    silverCount = 0;
    bronzeCount = 0;
    for j = 1: length(gold)
        if country == gold(j, :)
            goldCount = goldCount+ 1;
        end
        if country == silver(j, :)
            silverCount = silverCount + 1;
        end
        if country == bronze(j, :)
            bronzeCount = bronzeCount + 1;
        end
    end
    results(i,1) = goldCount;
    results(i,2) = silverCount;
    results(i,3) = bronzeCount;
    results(i,4) = goldCount + silverCount + bronzeCount;
end
results
end

% HERE! Below is the part I'm having issues with! Please Help!
function [ ] = print_country_results(countries,results)
% prints formatted results
fprintf('Country Gold Silver Bronze Total\n')
for i = 1:length(countries) % = 27
        fprintf('%s %d \n', countries(i, :), results (i,:));
    end
end

Can I print a matrix & string row by row? Please help!

EDIT: We are not allowed to use a table. :(

[James Tursa]

What is the variable 'countries'? I.e., class. Same question for gold, silver, bronze.

[Ashley Hayden]

Countries (27x3) is a char class. Gold, silver, and bronze are also char class. I have attached the file with all the starting variables (olympics.mat). They look like this:

  'AUS'
    'AUT'
    'BLR'
    'CAN'
    'CHN'
    'CRO'
    'CZE'
    'EST'
    'FIN'
    'FRA'
    'GBR'
    'GER'
    'ITA'
    'JPN'
    'KAZ'
    'KOR'
    'LAT'
    'NED'
    'NOR'
    'POL'
    'RUS'
    'SLO'
    'SUI'
    'SVK'
    'SWE'
    'USA'
    'XXX'

Answer 1

[Ameer Hamza]

You can change your function like this

function [ ] = print_country_results(countries,results)
% prints formatted results
    fprintf('Country\tGold\tSilver\tBronze\tTotal\n')
    for i = 1:length(countries) % = 27
        fprintf('%s\t%d\t%d\t%d\t%d\n', countries(i, :), results (i,:));
    end
end

Output:

Country	Gold	Silver	Bronze	Total
AUS	2	1	0	3
AUT	4	6	6	16
BLR	1	1	1	3
CAN	14	7	5	26
CHN	5	2	4	11
CRO	0	2	1	3
CZE	2	0	4	6
EST	0	1	0	1
FIN	0	1	4	5
FRA	2	3	6	11
GBR	1	0	0	1
GER	10	13	7	30
ITA	1	1	3	5
JPN	0	3	2	5
KAZ	0	1	0	1
KOR	6	6	2	14
LAT	0	2	0	2
NED	4	1	3	8
NOR	9	8	6	23
POL	1	3	2	6
RUS	3	5	7	15
SLO	0	2	1	3
SUI	6	0	3	9
SVK	1	1	1	3
SWE	5	2	4	11
USA	9	15	13	37
XXX	1	0	2	3

[Ashley Hayden]

Thank you! Good to know I only missed something simple.

Answer 2

[James Tursa]

When comparing strings, it is not a good idea to use the == operator, which is an element-wise operator. Instead, use a string comparison function or a general comparison function. E.g., instead of this

if country == gold(j, :)

do something like this

if isequal( country, gold(j, :) )

or maybe

if strcmpi( country, gold(j, :) )

Also, in your print statement you need to print four numerical values, not one. E.g. this

    fprintf('%s %d \n', countries(i, :), results (i,:));

should be something like this instead

    fprintf('%s %7d %6d %6d %5d \n', countries(i, :), results (i,:));

Answer 3

[Adam Danz]

Put the data into a table and display the table. There are lots of way to create a table. Here's one way,

data = [2 1 3; 3 1 4]; 
T = array2table(data, 'VariableNames', {'Gold','Silver','Bronze'}, 'RowNames', {'CAN','ITA'}); 

To display it,

disp(T)

[Ashley Hayden]

I should've mentioned it in the question itself - I'm not allowed to use a table. Is there a way I can use fprintf?