Qt QTreeView使用-QStandardItemModel的使用

本人通过亲自实践，教大家一步步在win下安装xgboost(http://blog.csdn.net/jingyi130705008/article/details/71435562)，这个是之前的xgboost的C++版本，是在python使用xgboost之前必须的包。

频谱仪的介绍、操作及性能指标，硬件工程师必须学会的测量器件之一。Definitions and conditionsSpecifications describe the performance of parameters covered by the productwarranty and apply to the full temperature of 0 to 55C, unless otherwisenotedGet more Information95th percentile values indicate the breadth of the population (approx. 2 o) of perfor-This EXA signalanalyzer datamance tolerances expected to be met in 95 percent of the cases with a 95 percentsheet is a summary of theconfidence, for any ambient temperature in the range of 20 to 30C. In addition tothe statistical observations of a sample of instruments, these values include thespecifications and conditionseffects of the uncertainties of external calibration references these values are notfor N9010A EXA and N9010AEPwarranted. These values are updated occasionally if a significant change in theExpress EXA signal analyzers.statistically observed behavior of production instruments is observedwhich are available in the EXASignalAnalyzer SpecificationTypical describes additional product performance information that is not covered byGuide(N9010-90025)the product warranty It is performance beyond specifications that 80 percent of theunits exhibit with a 95 percent confidence level over the temperature range 20 toFor ordering informationkrefer30C. Typical performance does not include measurement uncertaintyto the EXA Signal AnalyzerConfiguration GuideNominal values indicate expected performance, or describe product performance59896531Nthat is useful in the application of the product, but are not covered by the productwarrantyThe analyzer will meet its specifications whenIt is within its calibration cycleUnder auto couple control, except when Auto Sweep Time rules= AccySignal frequencies 10 MHZ, with DC coupling appliedThe analyzer has been stored at an ambient temperature within the allowedoperating range for at least two hours before being turned on; if it had previouslybeen stored at a temperature range inside the allowed storage range, but outsidethe allowed operating rangeThe analyzer has been turned on at least 30 minutes with auto align set tonormal, or, if Auto align is set to off or partial, alignments must have been runrecently enough to prevent an Alert message; if the Alert condition is changedfrom Time and Temperature to one of the disabled duration choices, the analyzermay fail to meet specifications without informing the userFor the complete specifications guide, visitwww.agilent.com/find/exaspecifications1. For earlier instruments/Serial number prefix MY/SG/US5052), the full temperature rangesfrom5t50°CFrequency and Time specificationsFrequency rangeDC coupledAC coupledOption 50310 Hz to 3.6 Gh10 MHz to 3. 6 GHzOption 50710 Hz to 7 GH10 MHz to 7 GHzOption 51310 Hz to 13.6 GHz10 MHz to 13.6 ghzOption 52610 Hz to 26.5 GH10 MHz to 26.5 GhzOption 53210 Hz to 32 gHzNAOption 54410 Hz to 44 gHzNABandLO multiple(N)10 Hz to 3. 6 GHz3.5to7.0GH3.5to8.4GH28.4 to 13.6 GHz3135to17.1GH17 to 26.5 GHz5426.4 to 34.5 ghz344t044GHzFrequency referenceAccuracy+l time since last adjustment x aging rate)+ temperature stability t calibrationaccuracyAging rateOption pFrStandardy±1×106/year±15X107/2 yearsTemperature stabilityOption PFrStandard20to30°c±15×108±2×106Full temperature range±5x1±2×10Achievable initial calibration accuracyOption PFrStandard±4x108±1410Example trequency reterence accuracy=±(1×107+5×103+4×10-)(with Option PFR1 year after last adjustment±19x10Residual fmOption pFr

大一学生用纯c语言编写打字游戏，内容简单易懂，但是功能也很齐全，很人性化，适合初学者参考

Jsp+Servlet+Echarts实现动态数据可视化，对应讲解博文：https://blog.csdn.net/ITBigGod/article/details/81023802

穷举法解决背包问题，想要资源的一看题目就知道，不需要多花字数来介绍

基于matlab的zigbee仿真，基于matlab的zigbee仿真，基于matlab的zigbee仿真

sil9022 sil9034 HDMI 输出芯片驱动原代码,IIC通讯。

变频器恒压供水，非常完善的S7200SMRT ，PLC程序，有详细的中文注解，主程序，子程序，PID调节，一应俱全。下来就可以应用在项目上。

霍夫变换检测圆和直线 数字图像处理的课程设计 直接使用 非常方便

这是基于SIMULINK的一个MSK通信系统仿真。包含脉冲编码和解码，MSK调制与解调。