小编tes*_*goe的帖子

我正在使用saveImage保存图像.

func saveImage (image: UIImage, path: String ) -> Bool{

    let pngImageData = UIImagePNGRepresentation(image)
    //let jpgImageData = UIImageJPEGRepresentation(image, 1.0)   // if you want to save as JPEG

    print("!!!saving image at:  \(path)")

    let result = pngImageData!.writeToFile(path, atomically: true)

    return result
}

新信息:

保存文件无法正常工作(打印"[ - ] ERROR SAVING FILE") -

            // save your image here into Document Directory
        let res = saveImage(tempImage, path: fileInDocumentsDirectory("abc.png"))
        if(res == true){
            print ("[+] FILE SAVED")
        }else{
            print ("[-] ERROR SAVING FILE")
        }

为什么saveImage函数没有保存图像？访问权限？

旧信息:

调试信息说:

!!!saving …

我用

sns.distplot 

绘制单变量的观测分布.不过,我不仅需要图表,还需要数据点.如何从matplotlib轴获取数据点(由distplot返回)？

我想绘制一个相关图.

features = features[,-2]
features<- scale(features[2:ncol(features)],center=TRUE,scale=TRUE);
correlationmatrix <- cor(features)
corrplot(correlationmatrix, order = "hclust")

直到第3行,一切正常.跑步时corrplot(),我得到:

if(min(corr)<-1 - .Machine $ double.eps || max(corr)> 1 + .Machine $ double.eps){:缺少值需要TRUE/FALSE时出错