Adding specified loop outputs

S
S
2024 3 28
1 个回答
回答已采纳
更新时间：2024 4 11
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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!

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Matt J
Matt J 2024-3-28
编辑：Matt J 2024-3-28
You haven't provided a .mat file of input data so your code cannot be run.
Mathieu NOE
Mathieu NOE 2024-3-29
hello again
what is the size of output ?
S
S 2024-3-30
>> size(output)
ans =
5 2000
@Mathieu NOE
Torsten
Torsten 2024-3-30
编辑：Torsten 2024-3-30
Ran in:
Ran in:
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
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
output(1:3)
ans = 1×3
0.0093 0.5921 0.0947
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<mw-icon class=""></mw-icon>
Sum1=sum(output(1:3))
Sum1 = 0.6961
Thus you try to plot one single value (which seems to be 0 in your case).

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 采纳的回答

Mathieu NOE
Mathieu NOE 2024-4-2
Ran in:

1 个投票

Ran in:
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
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
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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<mw-icon class=""></mw-icon>
plot(Sum1)

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S
S 2024-4-9
@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
Stephen23 2024-4-9
"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
S 2024-4-11
@Stephen23 there are 32 rows

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