Error on Switch/case with cell array char data

Question

James Wang 2020-11-21

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/655243-error-on-switch-case-with-cell-array-char-data

回答： James Wang 2020-11-21

Hello I am getting "SWITCH expression must be a scalar or a character vector." when i run my code bellow. I want to take an typed input from the user split it into individual cells and then check the variable with the created switch case concatenating the resulting letter's probability into a new variable. I know it has something to do to converting the inputted cell values into a character vector but I haven't found any good way to do it. Any help would be appreciated

get = input('type(letters only, no puncuation): ' , 's');
split = num2cell(get);
sorted_split = sort(split);
input_prob = [];
for n = 1 : length(sorted_split)
    switch sorted_split{n}
        case ' '
            horzcat(input_prob,0.1859);
        case 'a'
            horzcat(input_prob,0.0642);
        case 'b'
            horzcat(input_prob,0.0127);
    end
end
            ...
                

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Cris LaPierre 2020-11-21

Your code runs for me without giving the error message you mention. Can you share exactly what you are using for input to create the error? Also, please copy/paste the error message here (all the red text). I wonder if the error may be coming from code that you have not shared here.

James Wang 2020-11-21

编辑：James Wang 2020-11-21

My apologies I have forgotten that I have been playing around with parfor loops for no real reason expect for speed. the error message that is given is

Error using fff (line 9)

SWITCH expression must be a scalar or a character vector.

%#ok<*MFAMB>
tic
close all
get = input('type(letters only, no puncuation): ' , 's');
split = num2cell(get);
input_prob = [];
parfor n = 1 : length(split)
    
    switch split(n)
        case ' '
            horzcat(input_prob,0.1859);
        case 'a'
            horzcat(input_prob,0.0642);
        case 'b'
            horzcat(input_prob,0.0127);
        case 'c'

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Answer 1

James Wang 2020-11-21

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/655243-error-on-switch-case-with-cell-array-char-data#answer_551528

After looking at multiple answer i have solved my question. I have removed the parfor loop that was there and used Vasishta Bhargava answer for the switch case. Thank you all for your help

close all
get = input('type(letters only, no puncuation): ' , 's');
split = char(lower(get));
input_prob = [];
for n = 1 : length(split)
    
    switch split(n)
        case ' '
            input_prob = horzcat(input_prob,0.1859);
        case 'a'
            input_prob= horzcat(input_prob,0.0642);
        case 'b'
            input_prob = horzcat(input_prob,0.0127);
        case 'c'
            input_prob = horzcat(input_prob,0.0218);
        case 'd'