Examine the following MATLAB statements . Are they correct or incorrect ? if volts >125 disp (' WARNING : High voltage on line .'); if volts <105 disp (' WARNING : Low voltage on line .'); else disp (' Line voltage is within tolerances .'); end 是否正确，中文解答，分析

这段 MATLAB 代码存在语法错误。正确的代码应该是：

if volts > 125
    disp('WARNING: High voltage on line.');
elseif volts < 105
    disp('WARNING: Low voltage on line.');
else
    disp('Line voltage is within tolerances.');
end

这段代码使用了 if-elseif-else 语句，首先判断 volts 是否大于 125，如果是则显示 "WARNING: High voltage on line."。如果 volts 不大于 125，则判断 volts 是否小于 105，如果是则显示 "WARNING: Low voltage on line."。如果 volts 既不大于 125，也不小于 105，则显示 "Line voltage is within tolerances."。

原始代码的问题在于，它没有使用 elseif 语句，而是在第一个 if 语句后面直接使用了一个 if 语句。这样的话，如果 volts 大于 125，第二个 if 语句还是会执行，导致程序出错。

相关问题

Examine the following MATLAB statements . Are they correct or incorrect ? color =' yellow '; switch ( color ) case ' red ', disp (' Stop now !'); case ' yellow ', disp (' Prepare to stop .'); case ' green ', disp (' Proceed through intersection .'); otherwise , disp (' Illegal color encountered .'); end disp (' Stop now !'); case ' yellow ', disp (' Prepare to stop .'); case ' green ', disp (' Proceed through intersection .'); otherwise , disp (' Illegal color encountered .'); end

The given MATLAB statements are incorrect. The 'disp (' Stop now !');' statement is outside the switch statement and does not have any case associated with it. It should be removed or placed inside a relevant case statement. The corrected code is shown below:

color = 'yellow';
switch (color)
    case 'red'
        disp('Stop now!');
    case 'yellow'
        disp('Prepare to stop.');
    case 'green'
        disp('Proceed through intersection.');
    otherwise
        disp('Illegal color encountered.');
end

Note that the 'otherwise' statement will execute if the input color does not match any of the defined cases.

10:35:56.822 Module build failed (from ./node_modules/@dcloudio/vue-cli-plugin-uni/packages/sass-loader/dist/cjs.js): 10:35:56.830 SassError: Undefined variable: "$u-form-item-height". 10:35:56.830 on line 210 of D:\ideaWorkSpace\ehl-wx\applicationCenter\knowledgeBase\addQuestion.vue 10:35:56.839 >> line-height: $u-form-item-height; 10:35:56.848 ------------------^ 10:35:56.856 Module build failed (from ./node_modules/@dcloudio/vue-cli-plugin-uni/packages/sass-loader/dist/cjs.js): 10:35:56.863 SassError: Undefined variable: "$u-form-item-height". 10:35:56.873 on line 220 of D:\ideaWorkSpace\ehl-wx\applicationCenter\examine\answerQuestion.vue 10:35:56.873 >> line-height: $u-form-item-height; 10:35:56.880 --------------------^ 10:35:56.880 Module build failed (from ./node_modules/@dcloudio/vue-cli-plugin-uni/packages/sass-loader/dist/cjs.js): 10:35:56.889 SassError: Undefined variable: "$u-form-item-height". 10:35:56.896 on line 220 of D:\ideaWorkSpace\ehl-wx\applicationCenter\knowledgeBase\answerQuestion.vue 10:35:56.903 >> line-height: $u-form-item-height; 10:35:56.904 --------------------^ 10:35:56.913 Module build failed (from ./node_modules/@dcloudio/vue-cli-plugin-uni/packages/sass-loader/dist/cjs.js): 10:35:56.913 SassError: Undefined variable: "$u-form-item-height". 10:35:56.921 on line 232 of D:\ideaWorkSpace\ehl-wx\applicationCenter\examine\addQuestion.vue 10:35:56.930 >> line-height: $u-form-item-height; 10:35:56.930 ------------------^ 10:35:56.938 Module build failed (from ./node_modules/@dcloudio/vue-cli-plugin-uni/packages/sass-loader/dist/cjs.js): 10:35:56.938 SassError: Undefined variable: "$u-form-item-height". 10:35:56.946 on line 350 of D:\ideaWorkSpace\ehl-wx\pages\service\addService.vue 10:35:56.947 >> line-height: $u-form-item-height; 10:35:56.954 -------------------^解决

这个错误是因为在编译过程中找不到Sass变量"$u-form-item-height"。要解决这个问题，你可以按照以下步骤进行操作：

1. 确保你已经正确引入了uview-ui组件，并且按照官方文档的要求进行了配置。
2. 检查你的项目中是否已经安装了Sass相关的依赖。可以通过运行`npm install sass-loader node-sass`来安装这些依赖。
3. 确保在你的项目中正确配置了Sass的loader。可以在项目的webpack配置文件或vue.config.js文件中添加相应的配置，确保Sass能够正确加载和解析。
4. 检查一下uview-ui版本和你当前项目的版本是否兼容。有时候不同版本之间可能会有变量命名的差异，需要进行相应的调整。
5. 如果以上步骤都没有解决问题，可以尝试手动定义变量"$u-form-item-height"并给它赋值。你可以在项目中的Sass文件或者全局样式文件中添加以下代码：

$u-form-item-height: xxxpx; // 替换为你想要的高度值，如 "40px"

替换 "xxxpx" 为你想要的高度值。然后重新编译项目，看看是否解决了问题。

如果问题仍然存在，建议查看uview-ui的官方文档或在相关社区寻求帮助，以获取更详细的解决方案。