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# How do I derive a linear equation for wind speed between 13km/h –50km/h using “if-else”?

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Thomas Portsmouth il 22 Giu 2020
Chiuso: MATLAB Answer Bot il 20 Ago 2021
for i = 1: length(Wind_Year)
if WindLight = nnz((Wind_Year >= 13) & (Wind_Year < 50));
Power = m * x + c;
Power = m * WindLight + c;
Power1 =[Power1; Power];
Day1 = [Day1; i];
elseif WindHeavy = nnz((Wind_Year >= 50) & (Wind_Year <= 100));
Power = m * x + c;
Power = m * WindHeavy + c;
Power2 = [Power2; Power];
Day2 = [Day2; i];
end
end
The data (13 - 50) and (50 - 100) is coming from 12 spreadsheets.

### Risposte (1)

Andreas Bernatzky il 22 Giu 2020
you have to index Wind_Year with your increment i.
For example Wind_Year(i) but heavily depends on what type of container your Wind_Year variable belongs to (Table,Vector,Cell...)
##### 2 CommentiMostra NessunoNascondi Nessuno
Thomas Portsmouth il 22 Giu 2020
source_directory = 'C:\Users\thoma\OneDrive\Desktop\Project 1';
source_file = dir(fullfile(source_directory, '*.csv'));
Wind_Year = [];
for i = 1: 12
file_name = fullfile(source_directory,source_file(i).name);
Wind_Month = file_data(:, 7);
Wind_Year = [Wind_Year; Wind_Month];
end
This is where my Wind_Year is coming from, its 12 spredsheets of data.
Andreas Bernatzky il 27 Lug 2020
Hello Thomas,
sorry for the late reply. Maybe you can attach one of the (shorter) excel-Sheets?
Than I can have a better look on it.
Your code looks ok to me for iterating over all sheets.

R2019b

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