select row and iterate for next rows

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Venkatesh Baskaran 2016-8-2

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评论： Venkatesh Baskaran 2016-8-2

I have 100 rows and 4 columns of data. I want to go row by row, extract data, assign each column for parameters and do calculation and store as output. Similarly, I need to select next rows and so on. From all outputs, I need to select the least value. For that least output, I need to get the row number also.

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Stephen23 2016-8-2

编辑：Stephen23 2016-8-2

@Venkatesh Baskaran: I know what your task is. I don't know what your question is.

A question starts with the words "why", "what", "how", etc., and has a question mark at the end. For example:

"How do I write nested loops in MATLAB?"

"What is the best way to solve this task?"

"Can someone please write some code for me?"

"I tried to do XXX, why does it give result YYY when I expect ZZZ?"

I have no idea what you are struggling with, because so far you have only told us what your task is. But you have not asked us anything.

Venkatesh Baskaran 2016-8-2

My Question: How to read each row from Propeller & Motor, then do calculations for Power. Store each Power output from all Prop_Motor combination in separate variables. From all Power output, how to select the min Power and how to display the corresponding Propeller and Motor combination.

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采纳的回答

Azzi Abdelmalek 2016-8-2

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在 MATLAB Online 中打开

A=randi(100,100,4)
[n,m]=size(A)
for k=1:n % loop each row
 r=A(k,:)  % get the kth  row
 % Do 
end

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Azzi Abdelmalek 2016-8-2

Is this a question? then why have you accepted the answer?

Venkatesh Baskaran 2016-8-2

I want to find out the combination of 1 Propeller and 1 Motor for least Power, which is calculated using parameters from Prop & Motor.

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Thorsten 2016-8-2

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/298092-select-row-and-iterate-for-next-rows#answer_230541

在 MATLAB Online 中打开

If you want to multiply column 1 by alpha = 23 and add column 2, for example, you can to this as follows:

alpha = 23;
y = alpha*A(:,1) + A(:,2);

To find the minimum value and its index, use

[miny, idx] = min(y);

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Venkatesh Baskaran 2016-8-2

I have 10 Propellers and 10 Motors. I need to select each Propeller and Motor and do Calculations and find Electric Power. the program should give the right combination of Propeller and Motor which gives least Electric Power. It has to go through all possible combinations for my calculation of Electric power. (Note: Propeller have 4 parameters, Motor have 3 parameters) .

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