Vector problem

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?

Answer 1

[Fangjun Jiang]

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);