如果程序中使用到bool类型，但编译时提示类型未定义，这个时候可在头文件中加入下面一句：typedef enum {FALSE = 0，TRUE = 1} bool；
2021-12-24 08:11
:TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; 所有提示未定义的代码都已经确定定义过，但为什么会出现这样的情况？ 最后发现，在stm32f10x_conf.h 里面包含stm32f10x_t
2014-11-14 18:38
这个程序不能运行，有谁知道怎么改？帮帮忙。
2012-05-10 10:51
、DMA_INSTANCE_TYPE、UART1_CONFIG未被定义、和UART_INSTANCE_CLEAR_FUNCTION()函数为隐式声明的警告。问题原因以DMA_INSTANCE_TYPE举例。在
2022-02-15 07:24
全部代码在附件：% GUI部分functionCCPSO2_GUIclc;clear all;objective_function = @(x) sum(x.^2); %Test function;variable_domain = [-5.12,5.12]; %The minimum and maximum value of each variable.iteration_max = 100;dim = 1000;%% GUI设计h = figure(1);% 对图分区set(h,'name','CCPSO2应用','numbertitle','off','Color',[.8,.8,.8],'position',[400,400,400,400]);uipanel('Parent',h,'Fontsize',10, 'BackgroundColor','c','Position',[0.005,0.005,0.5,0.6]);uipanel('Parent',h,'Fontsize',10, 'BackgroundColor','c','Position',[0.005,0.62,1,0.37]);% 输入函数及其各维可行域uicontrol(h,'Style','text','String','输入目标函数(匿名函数)','Fontname','隶书','Fontsize',12,'units','normalized','BackgroundColor','c','Position',[0.01,0.77,0.16,0.18]);he1 = uicontrol(h,'Style','edit','units','normalized','Position',[0.18,0.8,0.8,0.16],'Background','w','String','@(x) sum(x.^2)');uicontrol(h,'Style','text','String','输入变量可行域','Fontname','隶书','Fontsize',12,'units','normalized','Position',[0.01,0.625,0.16,0.12]);he2 = uicontrol(h,'Style','edit','units','normalized','Position',[0.18,0.65,0.8,0.1],'Background','w','String','[-5.12,5.12]');% 设置参数uicontrol(h,'Style','text','String','参数设置','Fontname','隶书','Fontsize',14,'units','normalized','BackgroundColor','c','Position',[0.01,0.48,0.44,0.1]);uicontrol(h,'Style','text','String','设置最大迭代次数(整数) :','units','normalized','BackgroundColor','c','Position',[0.01,0.4,0.19,0.1]);he3 = uicontrol(h,'Style','edit','units','normalized','Position',[0.21,0.43,0.26,0.08],'String','2');uicontrol(h,'Style','text','String','设置变量维数(整数) :','units','normalized','BackgroundColor','c','Position',[0.01,0.25,0.19,0.1]);he4 = uicontrol(h,'Style','edit','units','normalized','Position',[0.21,0.29,0.26,0.08],'String','1000');uicontrol(h,'Style','text','String','设置候选集S :','units','normalized','BackgroundColor','c','Position',[0.01,0.1,0.19,0.1]);he5 = uicontrol(h,'Style','edit','units','normalized','Position',[0.21,0.14,0.26,0.08],'String',' [2,5,10,50,100,250]');uicontrol(h,'Style','text','String','注：改变变量维数的同时，需改变候选集S！','Fontsize',10,'units','normalized','ForegroundColor','r','Background','c','Position',[0.005,0.01,0.49,0.1]);% 获取参数值fitness_function = eval(get(he1,'String'));variable_domain = str2num(get(he2,'String'));iteration_max = str2num(get(he3,'String'));dim = double(str2num(get(he4,'String')));S = double(str2num(get(he5,'String')));% 开始按钮ht1 = uicontrol(h,'Style','text','Fontsize',10,'Background','c','units','normalized','Position',[0.52,0.28,0.47,0.07]);% 显示最优点；ht2 = uicontrol(h,'Style','text','Fontsize',10,'Background','c','units','normalized','Position',[0.52,0.1,0.47,0.07]);% 显示最优值；uicontrol(h,'Style','text','String','所得最优点 ：','Fontsize',10,'Background',[.8,.8,.8],'units','normalized','Position',[0.55,0.35,0.4,0.05]);uicontrol(h,'Style','text','String','最优值为 ：','Fontsize',10,'Background',[.8,.8,.8],'units','normalized','Position',[0.55,0.17,0.4,0.05]);hp = uicontrol(h,'Style','Pushbutton','String','开始','units','normalized','Position',[0.65,0.45,0.2,0.1]);set(hp,'Callback','[solution,fitness] = CCPSO2( variable_domain,objective_function);','set(ht1,'String',num2str(solution));','set(ht2,'String',num2str(fitness));');问题：按下‘开始’按钮时，总出现以下问题：Undefined function or variable 'variable_domain'. Error while evaluating uicontrol Callback而直接调用CCPSO2函数，则没有问题，不知道是何原因？
2013-05-17 10:39
设计实体是VHDL语言设计的基本单元，设计实体是VHDL语言设计的基本单元，简单的可以是一个与门，复杂的可以是一个微处理器或一个数字系统，其结构基本是一致的，都是由实体说明和结构体两部分组成。
2017-01-22 11:10
一、PC电源改12V充电器：PC电源有AT、ATX两种，结构大同小异。它都是基于PWM开关电源的原理，标称功率都在200W以上，都有12V8A的稳压输出。所以，用它来改造12V电瓶的充电器，是比较
2021-09-08 07:44
转在实际的项目中使用实体按键操作GUI的产品还挺多。借此专门做一个相关的例子，这个例子主要是给大家提供一种思路，实际的使用中还会遇到各种各样的情况，争取以后在论坛再发相关的例子时也配上实体按键操作
2016-10-19 09:42
ds18b20默认分辨率是12位的,如何能改变为10位,这是通过改变配置字节得到的,不知道怎么改高速暂存器的第四个字节(配置字节)如何更改.---第七页byte4
2016-08-31 18:46
，还可以由协会上书***决策层，来有根有据、稳步踏实地将区块链技术应用到全国范围的经济组织中（此段观点来自廖博谛）。现已有以下几类***支持的链改载体：链改实验室（面向实体企业、数字经济企业）、链
2020-06-30 17:07
