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POHow to write a loop to find maximum value and its correspond lag value on condition
 

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  1. POHow to write a loop to find maximum value and its correspond lag value on condition
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    <p>I just wrote a chunk to find out the largest spike in cross-correlation values, but when I ran the loop code there is no output at all. So I just want to ask if there's something wrong with my logic in writing loops or is there any thing I can try to revise the order. </p> <p>My intended logic for output:</p> <pre><code>for (i in 1:n) { if (y[i]=max(y[i]) &amp; x[i]&gt;0) { p=x[i] } else if (y[i]=min(y[i] &amp; x[i]&lt;0) { p=-x[i] } } </code></pre> <p>The rest else is omit because they input nothing. Please be note that <code>x[i]</code> and <code>y[i]</code> are in the same data frame.</p> <p>Below is my code (I found I've made a big mistake for my d1 input):</p> <p>Set Data Frame (I just uploaded the output of my ccf result):</p> <pre><code>lag&lt;-c(-26:26) acf&lt;-c(0.047407605,-0.082137676,0.034121452,0.039142063,-0.043329145,-0.020623160,0.039402880,0.015249114,-0.035820024,-0.015923312,0.037330662,0.006072103,-0.031716579,0.011451683,-0.010197626,-0.002019121,0.053034576,-0.046888611,-0.014243574,0.062941934,-0.008920250,-0.069821500,0.055471320,-0.047680416,0.041748427,-0.397052734,0.753759104,-0.354801338,0.040349059,-0.082996566,0.093101698,-0.120570604,0.052011432,-0.007482147,0.045102472,-0.064384729,0.048119729,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0) d1&lt;-data.frame(lag,acf) for(i in 1:length(d1[,2])) { if (d1[i,2] == max(d1[,2])) { if(d1[i,1]&gt;0){ cat(d[i,1]) cat("CHIE lags CHIQ \n") p=d1[i,1] } else { if (d1[i,2] == min(d1[,2]) &amp; d1[i,1]&lt;0) { d=-d1[i,2] cat(d) cat("CHIE leads CHIQ \n") p=d } } } </code></pre> <p>I am sorry that I do forget bunch of basic loop knowledge in C and want to take it back to my mind. Thanks a ton for your help!</p> <p>P.S I test some basic data frame and it does work, but unluckily it does not work on my own data set (No error, but no output). So I guess if there's something wrong with the output of ccf function as well.</p>
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    1. COI just replied. It gave me an error.
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    2. COI think that's impossible --- if you find all the '{' characters in your code, you'll find 5. If you find all the '}' characters in your code, you'll find 4. If you do the same calculation for my code, you'll find 5 of each. I have tested my code again - it definitely runs. You may not be starting with a clean input, or you may be adding another '}' at the end.
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    3. COI tried again. Yours does not generate any error. But it doesn't work. So I speculate it should be the input problem. I think it might have something to do with the ccf function.
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