Vector problem

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Lizan
Lizan 2011-7-23
I have a matrix
A =
Columns 1 through 5
1.5313 1.5316 1.5319 1.5321 1.5324
1.4612 1.4616 1.4619 1.4623 1.4627
1.4306 1.4308 1.4311 1.4314 1.4317
Columns 6 through 10
1.5327 1.5330 1.5333 1.5335 1.5338
1.4630 1.4634 1.4638 1.4641 1.4645
1.4319 1.4322 1.4325 1.4328 1.4331
Columns 11 through 15
1.5341 1.5344 1.5347 1.5349 1.5352
1.4649 1.4653 1.4656 1.4660 1.4664
1.4334 1.4337 1.4340 1.4343 1.4346
Columns 16 through 20
1.5355 1.5358 1.5361 1.5364 1.5367
1.4668 1.4672 1.4676 1.4680 1.4684
1.4349 1.4352 1.4355 1.4358 1.4361
Column 21
1.5369
1.4688
1.4364
I want to save all data that is A > 1.46 and A < 2.00, however when I use the command,
Index=and(neff_vec>2,neff_vec<1.46) neff_vec(Index)=0
it doesn't seem to do this.
However Index=and(neff_vec<2,neff_vec>1.46) does mark those that I want to save but neff_vec(Index) = 0 deletes those that I want to save.
Can anyone help me?

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采纳的回答

Fangjun Jiang
Fangjun Jiang 2011-7-23
neff_vec(Index)=0 doesn't delete those elements. It assign value 0 to those elements. Use neff_vec(Index)=[] to delete those elements.
Use the removing approach, it should be.
Index=or(neff_vec>=2,neff_vec<=1.46);
neff_vec(Index)=[];
Use the saving approach, it should be.
Index=and(neff_vec<2,neff_vec>1.46);
neff_vec=neff_vec(Index);

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