Help with splitting data point pairs

So I was tasked with defining my x and y with x= rcos(theta) and y=rsin(theta). Both r and theta are data arrays. My next step is to do the following: Utilize conditional statement(s) in order to split data point pairs into separate arrays depending on which quadrant they would fall into if plotted “y versus x”

I am unsure exactly what this is asking me to do and unsure how to go about it. Thank you!

Answer 1

[GGT]

BaconSwordfish. After many hours I finally got it. You need two new counters in a for loop with an if end statement like so assuming you already have x and y saved into arrays.

    for l=1:length(x) 
        if x(l)>0
            xQ14=x(x>0); %x is positive in quadrants 1 & 4
        end
        if x(l)<0
            xQ23=x(x<0);
        end
    end

[GGT]

By the way that is l as in lima in the parentheses; looks like the number one.

[BaconSwordfish]

After trying to use this there seems to be a slight problem. Although this does a great job splitting the data into their positive and negative terms, I need to create arrays of the four quadrants. However, I can not do this because not all of the arrays are of equal length. So I can not take the positive xQ14 and yQ12 and say this is quadrant 1. If that makes any sense.

Answer 2

[the cyclist]

I think it is asking you about this type of quadrant.

[BaconSwordfish]

I think you are right. However, I am unsure how to separate the data based off of what quadrant they fall in. Do you know how to?

[the cyclist]

Do you have values of x and y? You need to figure out if x and y are positive or negative.

[BaconSwordfish]

I'm supposed to find what quadrant each data pair falls in. I am not sure how to write a code to do this. x =

    4.0000
    0.5532
   -3.8499
   -1.6475
    3.3788
    2.6851
   -2.5332
   -3.5608
    1.2613
    4.0734
    0.4154
   -3.9223
   -2.2869
    2.7904
    3.8334
   -0.5779
   -4.2308
   -2.2213
    2.7094
    4.2620
    0.6174
   -3.7916
   -3.9238
    0.2480
    4.1960
    3.9210
   -0.1772
   -4.1438
   -4.4289
   -0.9147
    3.3773
    5.0458
    2.9349
   -1.2966
   -4.6658
   -5.0015
   -2.2154
    1.9058
    4.9653
    5.3493
    2.9717
    2.9717
   -0.9569
   -4.3751
   -5.4175
   -3.3918
    0.6331
    4.2419
    5.0696
    2.4382
   -1.9148
   -4.8094
   -3.9307
    0.1470
    4.0681
    4.3415
    0.5874
   -3.7022
   -4.2302
   -0.3277
    3.8949
    3.6832
   -0.8347
   -4.2979
   -2.3444
    2.6221
    4.0430
   -0.1022
   -4.0637
   -2.0992
    2.9653
    3.4812
   -1.4082
   -4.0333
   -0.1496
    3.9540
    1.4848
   -3.4611
   -2.5314
    2.7117
    3.2949
   -1.7923
   -3.7906
    0.7384
    4.0078
    0.4332
   -3.8911
   -1.6839
    3.3407
    2.9029
   -2.2422
   -3.8534
    0.5497
    4.1486
    1.5631
   -3.3331
   -3.5251
    1.1693
    4.3351
    1.8698
   -2.9846
   -4.2364
   -0.4971
    3.8440
    4.0079
   -0.0580
   -4.1011
   -4.1827
   -0.3547
    3.8220
    4.7504
    1.7829
   -2.6070
   -5.0684
   -3.9076
   -0.0607
    3.8490
    5.3771
    3.7096
   -0.0745
   -3.8369
   -5.6347
   -5.6347
   -4.4918
   -1.0446
    2.9490
    5.2549
    4.4342
    0.8644
   -3.2465
   -5.1200
   -3.3298
    0.9327
    4.4372
    4.2972
    0.4982
   -3.7134
   -4.4473
   -0.8783
    3.5429
    4.2175
    0.3012
   -3.9180
   -3.5139
    1.1421
    4.3223
    1.8810
   -3.0452
   -3.7418
    0.8513
    4.1681
    1.2650
   -3.5350
   -2.8114
    2.3531
    3.6949
   -1.0102
   -4.0157
   -0.2771
    3.9160
    1.4198
   -3.5059
   -2.3938
   -3.5059
    1.4198
    3.9160
   -0.2771
   -4.0157
   -1.0102
    3.6949
    2.3531
   -2.8114
   -3.5350
    1.2650
    4.1681
    0.8513
   -3.7418
   -3.0452
    1.8810
    4.3223
    1.1421
   -3.5139
   -3.9180
    0.3012
    4.2175
    3.5429
   -0.8783
   -4.4473
   -3.7134
    0.4982
    4.2972
    4.4372
    0.9327
   -3.3298
   -5.1200
   -3.2465
    0.8644
    4.4342
    5.2549
    2.9490
   -1.0446
   -4.4918
   -5.6347
   -5.6347
   -3.8369
   -0.0745
    3.7096
    5.3771
    3.8490
   -0.0607
   -3.9076
   -5.0684
   -2.6070
    1.7829
    4.7504
    3.8220
   -0.3547
   -4.1827
   -4.1011
   -0.0580
    4.0079
    3.8440
   -0.4971
   -4.2364
   -2.9846
    1.8698
    4.3351
    1.1693
   -3.5251
   -3.3331
    1.5631
    4.1486
    0.5497
   -3.8534
   -2.2422
    2.9029
    3.3407
   -1.6839
   -3.8911
    0.4332
    4.0078
    0.7384
   -3.7906
   -1.7923
    3.2949
    2.7117
   -2.5314
   -3.4611
    1.4848
    3.9540
   -0.1496
   -4.0333
   -1.4082
    3.4812
    2.9653
   -2.0992
   -4.0637
   -0.1022
    4.0430
    2.6221
   -2.3444
   -4.2979
   -0.8347
    3.6832
    3.8949
   -0.3277
   -4.2302
   -3.7022
    0.5874
    4.3415
    4.0681
    0.1470
   -3.9307
   -4.8094
   -1.9148
    2.4382
    5.0696
    4.2419
    0.6331
   -3.3918
   -5.4175
   -4.3751
   -0.9569
    2.9717
    2.9717
    5.3493
    4.9653
    1.9058
   -2.2154
   -5.0015
   -4.6658
   -1.2966
    2.9349
    5.0458
    3.3773
   -0.9147
   -4.4289
   -4.1438
   -0.1772
    3.9210
    4.1960
    0.2480
   -3.9238
   -3.7916
    0.6174
    4.2620
    2.7094
   -2.2213
   -4.2308
   -0.5779
    3.8334
    2.7904
   -2.2869
   -3.9223
    0.4154
    4.0734
    1.2613
   -3.5608
   -2.5332
    2.6851
    3.3788
   -1.6475
   -3.8499
    0.5532
y =

         0
    3.9628
    1.1037
   -3.6573
   -2.1781
    3.0067
    3.1533
   -1.9521
   -3.8793
    0.4664
    4.1021
    1.3510
   -3.4943
   -3.1470
    1.8070
    4.2327
    0.8125
   -3.7357
   -3.4495
    1.2024
    4.4293
    2.4564
   -2.3332
   -4.6074
   -2.0381
    2.6222
    4.7675
    2.4736
   -2.0554
   -4.8552
   -3.6870
    0.3871
    4.1984
    5.0208
    2.4064
   -1.7986
   -4.9043
   -5.1047
   -2.4053
    1.6108
    4.8134
    4.8134
    5.5040
    3.3613
   -0.5835
   -4.1780
   -5.2772
   -3.0930
    1.0905
    4.5050
    4.6844
    1.3672
   -2.9932
   -4.8804
   -2.5962
    1.9778
    4.6803
    2.8379
   -1.8428
   -4.5533
   -2.2890
    2.5366
    4.3489
    0.8765
   -3.6597
   -3.4183
    1.3799
    4.2367
    1.0845
   -3.6102
   -2.9012
    2.2094
    3.8506
   -0.6106
   -4.0580
   -0.8518
    3.7477
    2.0447
   -3.1116
   -2.9473
    2.2702
    3.5760
   -1.2811
   -3.9363
    0.1659
    3.9965
    1.0533
   -3.6775
   -2.3087
    2.8658
    3.4326
   -1.4667
   -4.1119
   -0.4788
    3.9047
    2.6174
   -2.4132
   -4.1464
   -0.3120
    3.9678
    3.2714
   -1.4327
   -4.4903
   -2.4624
    2.2862
    4.6644
    2.3304
   -2.2946
   -4.8129
   -3.0385
    1.3578
    4.6713
    4.3375
    0.7426
   -3.4089
   -5.2494
   -3.6654
    0.2169
    3.9911
    5.5167
    4.0605
    0.4999
    0.4999
   -3.3216
   -5.4175
   -4.5818
   -1.1601
    2.9305
    5.1781
    4.0435
    0.1612
   -3.8108
   -4.9122
   -2.1729
    2.3182
    4.8002
    2.9951
   -1.5720
   -4.5813
   -2.9560
    1.7473
    4.5077
    2.1562
   -2.6949
   -4.2350
   -0.4560
    3.8758
    2.9961
   -1.9897
   -4.1189
   -0.2590
    3.9509
    2.1221
   -2.9843
   -3.3321
    1.6845
    3.9166
   -0.3518
   -4.0104
   -0.8689
    3.7449
    1.9284
   -3.2046
   -1.9284
   -3.7449
    0.8689
    4.0104
    0.3518
   -3.9166
   -1.6845
    3.3321
    2.9843
   -2.1221
   -3.9509
    0.2590
    4.1189
    1.9897
   -2.9961
   -3.8758
    0.4560
    4.2350
    2.6949
   -2.1562
   -4.5077
   -1.7473
    2.9560
    4.5813
    1.5720
   -2.9951
   -4.8002
   -2.3182
    2.1729
    4.9122
    3.8108
   -0.1612
   -4.0435
   -5.1781
   -2.9305
    1.1601
    4.5818
    5.4175
    3.3216
   -0.4999
   -0.4999
   -4.0605
   -5.5167
   -3.9911
   -0.2169
    3.6654
    5.2494
    3.4089
   -0.7426
   -4.3375
   -4.6713
   -1.3578
    3.0385
    4.8129
    2.2946
   -2.3304
   -4.6644
   -2.2862
    2.4624
    4.4903
    1.4327
   -3.2714
   -3.9678
    0.3120
    4.1464
    2.4132
   -2.6174
   -3.9047
    0.4788
    4.1119
    1.4667
   -3.4326
   -2.8658
    2.3087
    3.6775
   -1.0533
   -3.9965
   -0.1659
    3.9363
    1.2811
   -3.5760
   -2.2702
    2.9473
    3.1116
   -2.0447
   -3.7477
    0.8518
    4.0580
    0.6106
   -3.8506
   -2.2094
    2.9012
    3.6102
   -1.0845
   -4.2367
   -1.3799
    3.4183
    3.6597
   -0.8765
   -4.3489
   -2.5366
    2.2890
    4.5533
    1.8428
   -2.8379
   -4.6803
   -1.9778
    2.5962
    4.8804
    2.9932
   -1.3672
   -4.6844
   -4.5050
   -1.0905
    3.0930
    5.2772
    4.1780
    0.5835
   -3.3613
   -5.5040
   -4.8134
   -4.8134
   -1.6108
    2.4053
    5.1047
    4.9043
    1.7986
   -2.4064
   -5.0208
   -4.1984
   -0.3871
    3.6870
    4.8552
    2.0554
   -2.4736
   -4.7675
   -2.6222
    2.0381
    4.6074
    2.3332
   -2.4564
   -4.4293
   -1.2024
    3.4495
    3.7357
   -0.8125
   -4.2327
   -1.8070
    3.1470
    3.4943
   -1.3510
   -4.1021
   -0.4664
    3.8793
    1.9521
   -3.1533
   -3.0067
    2.1781
    3.6573
   -1.1037
   -3.9628

[the cyclist]

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