How do I add the command lower() to my code? Also I'm supposed to use sort() but I don't know where or what for.

Question

Belle Dionido 2022-3-6

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1664554-how-do-i-add-the-command-lower-to-my-code-also-i-m-supposed-to-use-sort-but-i-don-t-know-where

评论： Dyuman Joshi 2022-3-7

This is my code:

disp('Welcome to the HONDA Price Statistics Report!');
disp(' ');
company = input('Enter the name of the company: ','s');
model = input('Enter the Model and Trim level: ','s');
correct = false;
while~correct
    price = input('Enter the input vector inside brackets of at least 6 values greater than 15,000[]: ');
    if length(price) < 6
        disp('You must enter at least 6 values all of which must be greater than $15,000');
    else
        if min(price) <= 15000
            disp('You must enter at least 6 values all of which must be greater than $15,000');
        else
            correct = true;
        end
    end
end
stat1 = input('Enter the name of the first statistic to calculate: ','s');
stat2 = input('Enter the name of the second statistic to calculate: ','s');
stat3 = input('Enter the name of the third statistic to calculate: ','s');
[res1,res2,res3] = HONDA_Statistics(stat1, stat2, stat3, price);
fprintf('\nCompany Name: %s\n', company);
fprintf('Model Name and The Trim Level: %s\n', model);
fprintf('The %s is: %5.2f\n', stat1, res1);
fprintf('The %s is: %5.2f\n', stat2, res2);
fprintf('The %s is: %5.2f\n', stat3, res3);
disp('Goodbye!');

And this is my user-made function:

function [res1,res2,res3] = HONDA_Statistics(stat1, stat2, stat3, price)
res1 = [];
res2 = [];
res3 = [];
if isequal('mean', stat1)
    res1 = mean(price);
else
    if isequal('std',stat1)
        res1 = std(price);
    else
        if isequal('median', stat1)
            res1 = median(price);
        else 
            disp('Input Invalid')
        end
    end
end
if isequal('mean', stat2)
    res2 = mean(price);
else
    if isequal('std',stat2)
        res2 = std(price);
    else
        if isequal('median', stat2)
            res2 = median(price);
        else 
            disp('Input Invalid')
        end
    end
end
if isequal('mean', stat3)
    res3 = mean(price);
else
    if isequal('std',stat3)
        res3 = std(price);
    else
        if isequal('median', stat3)
            res3 = median(price);
        else 
            disp('Input Invalid')
        end
    end
end

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Answer 1

Dyuman Joshi 2022-3-6

2
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1664554-how-do-i-add-the-command-lower-to-my-code-also-i-m-supposed-to-use-sort-but-i-don-t-know-where#answer_911014

在 MATLAB Online 中打开

Use lower() to convert all the input from the user to lowercase. User may input - 'Mean', 'MEAN', etc etc. Instead of checking all options convert them to lowercase and proceed further.

sort() was probably asked to use to get the minimum value but you used min()

Also, switch case would be a better option here than to use multiple if statements.

switch lower(stat1)
    case 'mean'
        res1=mean(price);
    case 'std'
        res1=std(price);
    case 'median'
        res1=median(price);
    otherwise
        disp('Input Invalid')
end

Extra tip - If you can use varargin, you can make it a loop instead of doing it 3 times.

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Belle Dionido 2022-3-7

So that didn’t work for me, I put lower(stat1); after the stat 1 input in my code. So:

stat1 = input('Enter the name of the first statistic to calculate: ','s'); lower(stat1);

Dyuman Joshi 2022-3-7

在 MATLAB Online 中打开

Try this -

stat1 = input('Enter the name of the first statistic to calculate: ','s'); 
Unable to run the 'fevalJSON' function because it calls the 'input' function, which is not supported for this product offering.
if isequal(lower(stat1),'mean')
    res1=mean(price);
elseif isequal(lower(stat1),'std')
    res1=std(price);
elseif isequal(lower(stat1),'median')
    res1=median(price);
else disp('Input Invalid');
end