How can I create a function with x represent the quantile percentage in a matrix, and y represent the standard deviation of the member above the quantile in the same matrix?

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AN NING
AN NING 2021-1-4
编辑： AN NING 2021-1-4
Hi dear MATLABers,
I have a matrix like this:
LT =
121.3957 0.5212 0.6972 0.5500 0.8765 114.5260
142.7236 0.4147 0.6956 0.3300 0.8438 144.9808
204.7423 0.4006 0.7005 0.5800 0.8816 89.8607
123.2311 0.4488 0.7061 0.5300 0.8731 119.6507
190.3483 0.3942 0.6660 0.4600 0.8490 144.0026
92.6061 0.4117 0.6884 0.4600 0.9131 51.5040
199.2636 0.3815 0.6801 0.2600 0.8388 83.0337
39.5882 0.3898 0.7415 0.3700 0.8088 82.7483
129.4222 0.6078 0.7227 0.1500 0.8675 190.7122
229.6893 0.4148 0.7366 0.2300 0.8544 161.0637
154.5270 0.2575 0.7082 0.4200 0.8275 104.8195
81.8630 0.5391 0.7189 0.1900 0.8239 103.3978
146.1449 0.3611 0.7115 0.3400 0.8352 147.8956
146.1449 0.3611 0.7115 0.3400 0.8352 147.8956
141.8454 0.4925 0.7126 0.3900 0.8494 148.2212
148.5955 0.4063 0.7514 0.1700 0.8860 91.4290
73.5833 0.1745 0.7011 0.3600 0.8784 46.4416
198.5560 0.5960 0.7338 0.3400 0.8566 46.4416
89.7714 0.4290 0.7063 0.5600 0.8059 88.6753
89.7714 0.4290 0.7063 0.5600 0.8059 88.6753
89.7714 0.4290 0.7063 0.5600 0.8059 88.6753
135.2273 0.3412 0.8931 0.3900 0.8508 98.7775
189.5320 0.4263 0.7046 0.3900 0.7692 105.3790
132.5747 0.4580 0.6956 0.3900 0.8535 147.6690
132.5747 0.4580 0.6956 0.3900 0.8535 147.6690
149.9398 0.4294 0.7178 0.3000 0.8258 107.5132
174.0811 0.4082 0.6747 0.4300 0.8462 28.7476
128.2167 0.3567 0.7125 0.5100 0.8727 72.5543
157.6313 0.4182 0.6870 0.3900 0.7655 88.4472
157.6313 0.3105 0.6660 0.4400 0.8980 49.8906
78.5714 0.4519 0.7563 0.5100 0.8000 88.7240
102.9956 0.3552 0.7128 0.5100 0.9331 207.8908
97.2441 0.3649 0.8454 0.3300 0.7810 84.4779
228.3058 0.3400 0.7115 0.4500 0.8722 107.7717
209.6454 0.4448 0.7253 0.5300 0.8869 84.8012
93.5638 0.3854 0.7584 0.2600 0.7790 115.2073
93.7328 0.4335 0.7109 0.3800 0.9063 74.2768
135.3994 0.3093 0.7301 0.4700 0.9125 85.8230
104.5597 0.3704 0.7312 0.4100 0.8805 46.8926
104.5597 0.3704 0.7312 0.4100 0.8805 46.8926
118.1658 0.3843 0.6448 0.3100 0.8603 111.9704
101.8272 0.3565 0.7067 0.3000 0.9500 53.1833
115.1713 0.3959 0.6840 0.4900 0.7643 76.6677
147.2571 0.2992 0.7046 0.4400 0.7667 24.2272
170.6086 0.4198 0.7533 0.3600 0.8403 184.6634
170.6086 0.4198 0.7533 0.3600 0.8403 184.6634
170.6086 0.4198 0.7533 0.3600 0.8403 184.6634
118.2149 0.4198 0.7756 0.4600 0.9237 26.7742
118.2149 0.4198 0.7756 0.4600 0.9237 26.7742
67.9027 0.3569 0.6726 0.2000 0.7790 139.4877
165.1095 0.5568 0.7482 0.4100 0.7963 143.8776
165.1095 0.3253 0.6734 0.3900 0.9176 143.8776
165.1095 0.3253 0.6734 0.3900 0.9176 143.8776
180.7574 0.4085 0.7123 0.5700 0.8248 82.2185
I need to plot a function with x represent the quantile percentage in LT, So the quantile of each column is quantile(LT,x), and y represents the sum of the standard deviation(std) of the member in LT above the quantile(LT,x) in each column.
I need to find the minimum number of y and its corresponding x.
thank you!

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