How to apply if else statement by reading values from a Table file on each value and save output?

Question

Shubham Lakhera 2021-7-3

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/870998-how-to-apply-if-else-statement-by-reading-values-from-a-table-file-on-each-value-and-save-output

回答： Yazan 2021-7-3

So, I have this code, This is working fine when only one value of Turbidity is given, it successfully gives me a output of TurbidityNEW.

num_col = size(Turbidity);
for i=1:num_col
        if Turbidity < 5 % Condition 1
        TurbidityNEW = 1;
    elseif Turbidity >=5 & Turbidity <= 10 % Condition 2
        TurbidityNEW = Turbidity/5;
    elseif Turbidity > 10 & Turbidity <= 500
        TurbidityNEW = (Turbidity+43.9)/34.5;   % Condition 3
        end
end

But, I need, this code to read multiple values of Turbidity from a Table(or double), then find where it lies, in condition 1 or 2 or 3, & then run the specific statement and give me the TurbidityNEW values in a table (or double).

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Answer 1

Yazan 2021-7-3

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/870998-how-to-apply-if-else-statement-by-reading-values-from-a-table-file-on-each-value-and-save-output#answer_739003

在 MATLAB Online 中打开

% generate values randomly between 0 and 500 for an example
a = 0;
b = 500;
Turbidity = (b-a).*rand(1000,1) + a;
TurbidityNEW = nan(size(Turbidity));
% to save the index of the satisfied condition (1, 2, or 3)
satCondition = nan(size(Turbidity));
num_col = size(Turbidity);
%%% your code modified %%%
for i=1:num_col
    cond = nan;
    if Turbidity(i) < 5                              % Condition 1
        TurbidityNEW(i) = 1;
        cond = 1;
    elseif Turbidity(i) >=5 && Turbidity(i) <= 10    % Condition 2
        TurbidityNEW(i) = Turbidity(i)/5;
        cond = 2;
    elseif Turbidity(i) > 10 && Turbidity(i) <= 500  % Condition 3
        TurbidityNEW(i) = (Turbidity(i)+43.9)/34.5;
        cond = 3;
    end
    satCondition(i) = cond;
end