尝试使用Cairo时出现以下错误：No font found in Rcairo_set_font
这是日志：
> library(Cairo)
> Cairo.capabilities()
png jpeg tiff pdf svg ps x11 win raster
TRUE FALSE FALSE TRUE TRUE TRUE TRUE FALSE TRUE
> Cairo(600, 600, file="plot.png", type="png", bg="white")
Error in Cairo(600, 600, file = "plot.png", type = "png", bg = "white") :
No font found in Rcairo_set_font
我在CentOS 7上使用R版本3.2.1（在Docker容器中）。
有人知道我怎么能避免这个错误吗？
我没有在网上找到任何解决此问题的内容......
答案 0 :(得分：0)
我已设法通过安装using System;
using Microsoft.Extensions.Caching.Memory;
namespace Memcache
{
public class Program
{
private static MemoryCache _cache;
private static int _cacheExpSecs;
public static void Main(string[] args)
{
_cache = new MemoryCache(new MemoryCacheOptions());
_cacheExpSecs = 2;
var cacheEntryOptions = new MemoryCacheEntryOptions()
.SetSlidingExpiration(TimeSpan.FromSeconds(_cacheExpSecs))
.RegisterPostEvictionCallback(callback: EvictionCallback);
_cache.Set(1, "One", cacheEntryOptions);
_cache.Set(2, "Two", cacheEntryOptions);
var autoEvent = new System.Threading.AutoResetEvent(false);
System.Threading.Timer timer = new System.Threading.Timer(checkCache, autoEvent, 1000, 6000);
Console.Read();
}
private static void checkCache(Object o)
{
if(_cache.Get(1)!=null)
{
Console.WriteLine(string.Format(@"checkCache: Cache with key {0} will be removed manually and will trigger the callback.", 1));
_cache.Remove(1);
}
else
{
Console.WriteLine(string.Format("checkCache: Cache with key {0} is expired.", 1));
}
if(_cache.Get(2) != null)
{
Console.WriteLine(string.Format("checkCache: Cache with key {0} will expire in {1} seconds, but won't trigger the callback until we check it's value again.", 2, _cacheExpSecs));
}
else
{
Console.WriteLine(string.Format("checkCache: Cache with key {0} is expired.", 2));
}
}
private static void EvictionCallback(object key, object value, EvictionReason reason, object state)
{
Console.WriteLine();
Console.WriteLine("/*****************************************************/");
Console.WriteLine(string.Format("/* EvictionCallback: Cache with key {0} has expired. */", key));
Console.WriteLine("/*****************************************************/");
Console.WriteLine();
}
}
}
包来解决此问题：
xorg-x11-fonts-Type1