Adding specified loop outputs

I am trying to make a figure which plots the sum of 3 specific loop outputs. output is the different outputs of the loop and I am trying to get the sum of output 1, 2, and 3. This is what I have:

figure

Sum1=sum(output(1:3));

plot(t,Sum1)

But I am just getting a blank graph and Sum1 for some reason has a value of 0 in my workplace. I am not sure which part of what I am doing is incorrect. Thank you for your time!

[Matt J]

You haven't provided a .mat file of input data so your code cannot be run.

[Mathieu NOE]

hello again

what is the size of output ?

[S]

>> size(output)

ans =

5 2000

@Mathieu NOE

[Torsten]

Example:

output = rand(5,2000)

output = 5×2000

0.0093 0.4352 0.6442 0.8223 0.0669 0.0750 0.1579 0.4659 0.4245 0.6393 0.5641 0.4505 0.4841 0.5146 0.3356 0.3269 0.7271 0.9070 0.5396 0.0868 0.7764 0.3069 0.7120 0.8052 0.9633 0.6658 0.3569 0.1724 0.1989 0.1068 0.5921 0.7917 0.6307 0.8559 0.3566 0.4708 0.3033 0.5932 0.8028 0.4506 0.3292 0.9448 0.2092 0.5576 0.1514 0.5201 0.8899 0.5369 0.4797 0.8613 0.6280 0.1493 0.3335 0.0613 0.5330 0.3729 0.5056 0.2013 0.3167 0.1885 0.0947 0.8074 0.7094 0.3982 0.4959 0.4298 0.9395 0.8940 0.6521 0.5169 0.6788 0.1383 0.9413 0.5478 0.0879 0.6249 0.1888 0.8520 0.4720 0.5320 0.0991 0.5874 0.9938 0.3726 0.8688 0.4819 0.6446 0.2709 0.1690 0.0696 0.7237 0.6625 0.5572 0.2795 0.1393 0.5328 0.8897 0.1949 0.1757 0.2561 0.0574 0.4576 0.8966 0.7007 0.4071 0.4533 0.5061 0.2979 0.8647 0.7720 0.0163 0.8398 0.7416 0.2130 0.3288 0.0865 0.1613 0.2869 0.6096 0.1663 0.8057 0.2727 0.5270 0.3867 0.4939 0.0631 0.1537 0.0135 0.6568 0.6885 0.1418 0.0855 0.8256 0.8523 0.3056 0.7419 0.5254 0.7348 0.0874 0.6650 0.5307 0.6938 0.7397 0.1528 0.8003 0.1851 0.3351 0.1735 0.0691 0.5860

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output(1:3)

ans = 1×3

0.0093 0.5921 0.0947

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Sum1=sum(output(1:3))

Sum1 = 0.6961

Thus you try to plot one single value (which seems to be 0 in your case).

Answer 1

[Mathieu NOE]

hello again

seems to me you want to sum the first 3 rows so

it should be :

Sum1=sum(output(1:3,:)); instead of Sum1=sum(output(1:3));

output = rand(5,2000)

output = 5x2000

0.1791 0.8425 0.6411 0.9862 0.3772 0.5695 0.0062 0.4191 0.0342 0.4738 0.1301 0.5518 0.6119 0.1510 0.9088 0.5260 0.4196 0.2989 0.1783 0.3134 0.7180 0.3725 0.1104 0.1097 0.2979 0.1851 0.7062 0.0656 0.1199 0.9486 0.5756 0.5375 0.3127 0.3970 0.1694 0.3851 0.8991 0.5512 0.2973 0.0736 0.0879 0.9771 0.1746 0.9450 0.8210 0.4277 0.6274 0.3267 0.7170 0.9286 0.1474 0.6039 0.4600 0.6433 0.4516 0.5993 0.9955 0.5155 0.3603 0.3852 0.1793 0.2607 0.9741 0.4219 0.0558 0.7762 0.7187 0.9905 0.8076 0.6963 0.0663 0.6098 0.1652 0.8677 0.4870 0.6077 0.4855 0.3860 0.0821 0.3845 0.3874 0.3454 0.6813 0.9306 0.7205 0.9261 0.8512 0.6857 0.4511 0.6153 0.8288 0.7844 0.1568 0.0911 0.2925 0.2977 0.1513 0.5298 0.4435 0.7714 0.5839 0.6496 0.3966 0.9823 0.9219 0.1772 0.1597 0.4256 0.9880 0.2713 0.7444 0.5459 0.4914 0.8019 0.6221 0.8412 0.1941 0.7266 0.0968 0.4999 0.9924 0.3889 0.5036 0.9485 0.9013 0.6529 0.4048 0.1062 0.2379 0.2751 0.9468 0.3906 0.3642 0.5598 0.9254 0.3007 0.4848 0.8409 0.0269 0.0066 0.3663 0.7956 0.3960 0.0903 0.1309 0.7850 0.9601 0.3460 0.0059 0.7290

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Sum1=sum(output(1:3,:))

Sum1 = 1x2000

0.9340 1.6407 1.9280 1.8050 0.6024 1.7308 1.6240 1.9609 1.1390 1.2437 0.2843 2.1387 0.9517 1.9636 2.2169 1.5615 1.5326 1.0116 0.9774 1.6264 1.2528 1.3218 1.2517 1.6836 1.4700 1.7104 2.5530 1.2668 0.9312 1.9491

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plot(Sum1)

[S]

@Mathieu NOE

So this works great until I use any number above 5 as start or finish then I get:

Index in position 1 exceeds array bounds. Index must not exceed 5.

Error in op (line 75)

Sum1=sum(output(start:finish,:));

[Stephen23]

"So this works great until I use any number above 5 as start or finish then I get: Index in position 1 exceeds array bounds. Index must not exceed 5."

Of course you will get that error: if you matrix only has five rows (as with the example give by Mathieu NOE) then what do you expect MATLAB to do when you try to access a non-existent sixth row? Or for that matter, any other row that does not exist.

[S]

@Stephen23 there are 32 rows