Retracting the time-tags from the histcounts

Question

Manoj Kumar V 2024-2-15

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2082553-retracting-the-time-tags-from-the-histcounts

评论： Manoj Kumar V 2024-2-17

A histogram (number of time-tags per unit bin) was created using "histcoounts" for a series of time-tags (first picture). After creating histogram, I put the threshold (300) on the count such that the values below the 300 shall get deleted. And the time-tags should be retractable for those values that were above the threshold. Could you please help me with getrting the values of time-tags from the second picture?

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Dyuman Joshi 2024-2-15

在 MATLAB Online 中打开

You can use the max() function -

y = 1:10
y = 1×10
     1     2     3     4     5     6     7     8     9    10
thresh = 5;
z = max(y, thresh)
z = 1×10
     5     5     5     5     5     6     7     8     9    10

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Answer 1

Dyuman Joshi 2024-2-15

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2082553-retracting-the-time-tags-from-the-histcounts#answer_1409638

在 MATLAB Online 中打开

timetags.txt

If you are working with R2019a or a later version, use readmatrix and writematrix. Otherwise, use writetable

D=readmatrix('timetags.txt');

%transposing as histcounts() returns a row vector

D1=histcounts(D, 'NumBins', 200).';

subplot(2,1,1);

plot(D1)

subplot(2,1,2);

D2=D1;

D2(D2<300)=[];

plot(D2)

%write data to a text file

writematrix(D2, 'tagtime.txt')

%check the contents of the file

type tagtime.txt

305 381 588 675 498 505 437 574 427 443 831 444 1134 418 406 376 337 366 383 369 602 1053 337 338 377 417 384 343 388 321 325 363 359 446 1088 397 300 304 333 566 524 438 387 432 355 1067 306 604 673 509 519 469 448 329 1027 855 325 896 712 733 354 331 408 578 786 640 311 307

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Dyuman Joshi 2024-2-16

在 MATLAB Online 中打开

timetags.txt

In that case -

D=readmatrix('timetags.txt');

%transposing as histcounts() returns a row vector

D1=histcounts(D, 'NumBins', 200).';

subplot(2,1,1);

plot(D1)

subplot(2,1,2);

idx = D1>300;

D2 = D1(idx);

plot(D2)

%write data to a text file

writematrix(D2, 'tagtime_extracted.txt')

%Remaining vales

D3 = D1(~idx);

writematrix(D3, 'tagtime_remaining.txt')

%check the contents of the file

type tagtime_extracted.txt

305 381 588 675 498 505 437 574 427 443 831 444 1134 418 406 376 337 366 383 369 602 1053 337 338 377 417 384 343 388 321 325 363 359 446 1088 397 304 333 566 524 438 387 432 355 1067 306 604 673 509 519 469 448 329 1027 855 325 896 712 733 354 331 408 578 786 640 311 307

type tagtime_remaining.txt

279 215 193 187 266 213 188 170 215 177 283 179 202 216 253 260 116 209 261 197 153 174 230 142 223 166 221 231 165 136 154 159 120 180 152 135 201 202 151 156 208 208 231 250 154 220 211 276 209 221 300 280 229 224 223 251 277 283 220 236 229 259 286 248 214 253 223 253 295 195 182 151 183 186 158 194 235 167 154 191 231 285 192 163 173 126 157 141 150 177 252 245 245 217 242 169 242 202 244 236 254 281 290 270 221 235 213 238 226 152 187 265 281 229 223 155 157 159 231 261 275 195 149 214 199 192 161 210 240 281 248 231 240

Dyuman Joshi 2024-2-17

That is what I have done here - https://in.mathworks.com/matlabcentral/answers/2082553-retracting-the-time-tags-from-the-histcounts#comment_3067268

Did you not check my comment?

Manoj Kumar V 2024-2-17

Yes. I could not find the timetags values as output.

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Answer 2

Image Analyst 2024-2-15

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https://ww2.mathworks.cn/matlabcentral/answers/2082553-retracting-the-time-tags-from-the-histcounts#answer_1409578

在 MATLAB Online 中打开

Try setting those counts to nan. Then they won't show up. Something like

data = 5000 * rand(1, 5000);
subplot(1, 2, 1);
[counts, binEdges] = histcounts(data);
plot(binEdges(1:end-1), counts, 'b-')
yline(300, 'r-')
counts(counts <= 300) = nan;
subplot(1, 2, 2)
plot(binEdges(1:end-1), counts)
grid on;