How to write a string in replace of a number in MATLAB?

Question

I am trying to categorise the years based on some conditions. If any year has rainfall less than a specific number it will indicate as a dry year. I have tried the following, but it gives me error "In an assignment A(I) = B, the number of elements in B and I must be the same."

The code is

Year_Category = zeros(ny,1);
for i = 1:ny;
    if (xy(i)< Lower_Limit)
        Year_Category(i) = 'Dry';
    elseif (xy(i)> Upper_Limit)
        Year_Category(i) = 'Wet';
    else
        Year_Category(i) = 'Average';
    end
end

Any help would be appreciated.

Best regards

rayryeng · Accepted Answer · 2015-11-02 06:35:03Z

2

You are trying to assign characters to a numeric array. That's why you're getting a dimension mismatch. Each character is a single slot and you can't do that in this case. Use cell arrays instead:

Year_Category = cell(ny,1); %// Change
for i = 1:ny;
    if (xy(i)< Lower_Limit)
        Year_Category{i} = 'Dry'; %// Change
    elseif (xy(i)> Upper_Limit)
        Year_Category{i} = 'Wet'; %// Change
    else
        Year_Category{i} = 'Average'; %// Change
    end
end

edited Nov 2, 2015 at 6:35

answered Nov 2, 2015 at 6:30

rayryeng

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2 Comments

shawpnik Over a year ago

Thank you rayryeng; it worked but it give me answer as a cell. But I would like to have the results as an array (double). When i have tried to convert cell into double (Year_Category_M = str2double(Year_Category); ) it shows all the values as NaN.

rayryeng Over a year ago

That's not possible. You are trying to assign characters to a double array. That's why I suggested a cell instead. This can work if you change Dry, Wet and Average to actual numbers instead... like 0, 1, or 2. You can't do this using characters.

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