How to add values from if statements to a column

Question

jacob Mitch 2019-10-9

0
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https://ww2.mathworks.cn/matlabcentral/answers/484443-how-to-add-values-from-if-statements-to-a-column

评论： jacob Mitch 2019-10-9

say I have

function [x,y]=valuesof(data)
input= data;
t=length(data);
for z=2:t
    if input(z-1)>input(z) && input (z)<input(z+1);
        x= 'the values of the indices' i.e z
        y= 'the input values of the sequence that satisfies the condition' input(z)
    end
end
end

how would I create a new colum for each value that satifies my if statement. The 1st column for the indice that the if statement is valid and the 2nd column for the value of input(z)

so for example if I have data of a column as

it would store the values of x

as

2
5

and y as

-3
-1

I would not like to use any built in matlab functions such as diff, sign and find etc. Thanks for the help

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Answer 1

Turlough Hughes 2019-10-9

1
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https://ww2.mathworks.cn/matlabcentral/answers/484443-how-to-add-values-from-if-statements-to-a-column#answer_395552

编辑：Turlough Hughes 2019-10-9

在 MATLAB Online 中打开

You just have to make an index for every time your if statement is satisfied. See the modified code.

function [x,y]=valuesof(data)
c=1; % new index
input= data;
t=length(data);
for z=2:t
    if input(z-1)>input(z) && input(z)<input(z+1);
        x(c,1)=z;
        y(c,1)=input(z);
        c=c+1;
    end
end
end