我遇到了一个困难的事情,似乎相当简单。我试图打开一个新窗口,窗口的角度为9。每次运行时,我都会看到一个窗口弹出一秒钟,然后它就会失败并抛出以下错误:
Error: Must provide a portal to attach
at throwNullPortalError (portal.js:23)
at DomPortalHost.attach (portal.js:320)
at GraphPopoutComponent.ngOnInit (graph-popout.component.ts:43)
at callHook (core.js:4686)
在提交form.it时,我得到了以下错误:在调用onSubmit时,该值是未定义的。错误和代码粘贴在下面。添加完整的HTML文件。我在用8角编码。
EmployeeComponent.html:14 ERROR TypeError: Cannot read property 'value' of undefined
at EmployeeComponent.onSubmit (employee.component.ts:38)
at Object.eval [as handleEvent] (EmployeeComponent.html:14)
at h
我正在尝试结合blitz++良好的数组语法进行任意精度的算术运算。我的问题是,像cos、exp等通用的数学函数不起作用:
#include <blitz/array.h>
#include <boost/multiprecision/float128.hpp>
using namespace boost::multiprecision;
using namespace blitz;
int main() {
float128 a = 1;
a = cos(a);
cout << a << endl;
Arr