上证指数涨跌额是怎么计算的，为什么我用收盘价-开盘价不等于涨跌额呢？

计算涨跌幅是以前一天的收盘价为起点，不是以当天的开盘价算的，如果今天是上涨的，那就等于在昨天收盘的基础上今天上涨了多少

时间         涨跌         幅度         开盘         最高        最低         收盘     成交量     成交额2010/11/0175.192.522986.893054.052986.893054.02212136776253939202010/11/02-8.59-0.283061.633089.573029.323045.43247101256309231122010/11/03-14.45-0.473044.023069.073017.13030.99212275692247261812010/11/0455.951.853035.373087.423035.373086.94196342866230744382010/11/0542.561.383129.873142.593105.923129.5227970089275354322010/11/0830.020.963140.43160.73124.093159.51223699948261671602010/11/09-24.51-0.783159.023159.023110.343135210097603250331992010/11/10-19.64-0.633120.443124.263093.883115.36204678943251614172010/11/1132.391.043108.513186.723102.773147.74235039416290302072010/11/12-162.31-5.163121.923150.152975.162985.43275732644303388202010/11/1528.980.972984.873016.132939.683014.41182643159200616002010/11/16-119.88-3.983007.643007.642885.752894.54202748641225428542010/11/17-55.68-1.922852.482891.052824.122838.86150755553162051652010/11/1826.590.942855.612873.72827.182865.45128359875130717972010/11/1923.110.812879.662888.752806.642888.57151705027158924802010/11/22-4.2-0.152861.612904.972852.772884.37149004431165210772010/11/23-56.09-1.942872.172872.172791.582828.28138528666147786472010/11/2431.651.122794.862861.492794.862859.94138859438150474822010/11/2538.331.342875.862901.682856.962898.26150993377169509042010/11/26-26.56-0.922890.292894.422851.962871.7124679936145357262010/11/29-5.34-0.192861.152878.832841.82866.36115034143135520192010/11/30-46.17-1.612863.412881.162758.922820.18164585298176139062010/12/013.270.122810.542834.22795.812823.4593095700105726962010/12/0220.160.712860.462870.812841.472843.61115736914133725142010/12/03-1.18-0.042846.722853.42822.742842.4396481075107496562010/12/0614.750.522850.382871.412831.72857.18103928535112639062010/12/0718.680.652843.772884.532809.112875.86101184184113049052010/12/08-27.32-0.952868.732880.562843.942848.5599224975111757542010/12/09-37.6-1.322837.612854.72808.512810.95104740659109956662010/12/1030.091.072798.742850.422792.522841.049241022599589232010/12/1381.912.882850.322923.772847.662922.95144036383161839732010/12/144.120.142928.32933.412912.422927.08132789463154467762010/12/15-15.66-0.542927.262939.052905.652911.41121115587144768022010/12/16-13.28-0.462908.862921.282891.862898.1495086940110768862010/12/17-4.4-0.152896.772898.8128812893.748104483894717992010/12/20-40.82-1.412901.472911.562804.562852.92133646244148829652010/12/2151.21.792857.592908.172846.632904.11126443459138778662010/12/22-26.22-0.92910.732917.22867.052877.9111527793127590602010/12/23-22.68-0.792874.22893.712849.842855.22101062523110854172010/12/24-20.06-0.72841.352853.492813.52835.169483360397556472010/12/27-53.76-1.92842.812876.812774.542781.4113573304125178032010/12/28-48.41-1.742768.032775.152730.412732.999940220998704152010/12/2918.540.682735.482753.032721.482751.537307270177247212010/12/308.050.292751.972768.132724.542759.578304522887203592010/12/3148.51.762759.162808.932758.132808.089457460210972824查找数据有两种方式，一种是直接上网站查询，如上交所，深交所及各类财经专业网站，另一种是下载一个股票软件，如钱龙，大智慧等，一般常用软件的键设置都是通用的（采取钱龙模式），通常只要进入软件主界面，先按F3键（上证指数）再按F5键切换到K线，最后按F1键就可以找到了。