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?

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!